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Iw-6-im fdivgl=EN-USop e6f t fref="Times N=" Romanop e+> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e∞),且对任意的正实数> -im fdivgl=EN-USop e6f t fref="Times N=" Romanop ex> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,a"-im >6-im fdivgl=EN-USop e6f t fref="Times N=" Romanop ey> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e都有> -im fdivgl=EN-USop e6f t fref="Times N=" Romanop ef(xy)=f(x)+f(y)> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,且当> -im >6-im fdivgl=EN-USop e6f t fref="Times N=" Romanop ex> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im fdivgl=EN-USop e6f t fref="Times N=" Romanop e1> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e时> -im >6-im fdivgl=EN-USop e6f t fref="Times N=" Romanop e, f(x) f t>> -im f?pd=bl'w .refamily: 黑体; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im fdivgl=EN-USop e6f t fref="Times N=" Romanop e0,6-im f?pd=bl"mso--imcerun: yesom" rtag">f(4)=1> f t>> trong>< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< f t>> trong>< pr< pr -im >tag">< pr -im >tag">< pr -im >tag">< pr -im >tag">< pr -im >tag">< pr -im >tag">< pr -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ex=y= f t>> im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,代入> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(xy)=f(x)+f(y) f t>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e中就有> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(1)=f(1)+f(1)> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,即> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(1)=2f(1)> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,故> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(1)=0> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,命题得证。> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6 pr -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ex=4 f t>> im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ey= f t>> -im f?pd=bl"w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: 宋体oop divgl=EN-USop e1/4 -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,代入> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6f t fref="Times N=" Romanop ef(xy)=f(x)+f(y)<-im f?pd=blomso--imcerun: yesom" rtag">< -im e6 f t>> im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e中就有> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(1)=f(4)+f( f t>> im e6-im f?pd=bl"w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: 宋体oop divgl=EN-USop e1/4 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e, -im e6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e从而求得 -im e6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl"w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: 宋体oop divgl=EN-USop e1/4 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,再令> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ex=y= f t>> -im f?pd=bl"w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: 宋体oop divgl=EN-USop e1/4, -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e代入> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(xy)=f(x)+f(y) f t>> im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,a"-im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(1/tm)=f( f t>> im e6-im f?pd=bl"w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: 宋体oop divgl=EN-USop e1/4 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e中就有> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(1/tm)= f t>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e﹣ -im e6w .r fref="Times N=" Romanop e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e2 -im e6-im f?pd=bl"w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: 宋体oop divgl=EN-USop e -im e6 f t>> pr -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(x)> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e在定义域(> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e, -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e∞)上的单调性。> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6 pr -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,a"-im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e+> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e∞)内设 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl'w .refamily: "MS Mincho"; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: "MS Mincho";'p e>x>w .r fref="宋体op e2 w .r>> -im f?pd=bl'w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "MS Mincho"; mso-tycsi-w .refamily: "MS Mincho"; mso-bidi-w .refamily: "MS Mincho";'p e,则 -im e6-im f?pd=bl'w .refamily: "MS Mincho"; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: "MS Mincho"; mso-ft1zast-w .refamily: 宋体o'p divgl=EN-USop ex1 -im e6-im f?pd=bl'w .refamily: "MS Mincho"; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: "MS Mincho"; mso-ft1zast-w .refamily: 宋体o'p divgl=EN-USop e/ x>w .r fref="宋体op e2 f t>>/-im e6-im f?pd=bl'w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "MS Mincho"; mso-tycsi-w .refamily: "MS Mincho"; mso-bidi-w .refamily: "MS Mincho";'p e>> -im >6-im f?pd=bl'w .refamily: "MS Mincho"; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-bidi-w .refamily: "MS Mincho"; mso-ft1zast-w .refamily: 宋体o'p divgl=EN-USop e -im e6-im f?pd=bl'w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "MS Mincho"; mso-tycsi-w .refamily: "MS Mincho"; mso-bidi-w .refamily: "MS Mincho";'p e,因为 -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e当 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e1 w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e时> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e, f(x) f t>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0, w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e所以tag">< -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0 w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,而tag">< -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e w .r>> pr< -im e6 w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e即tag">< -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,……① -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e<-im f?pd=bl"mso--imcerun: yesom" r< w .r>> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e令> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ex=x2 w .r>> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e< -im ey= /x w .r>>w .r fref="宋体op e2 w .r>> -im f?pd=bl'w .refamily: 宋体o w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "MS Mincho"; mso-tycsi-w .refamily: "MS Mincho"; mso-bidi-w .refamily: "MS Mincho";'p e,代 -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e入> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(xy)=f(x)+f(y) f t>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e中就有> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op r> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e)+f(1/x2 w .r>> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e即> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op r> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e) = w .r>> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e﹣ -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,将其代入 ① 得到 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op r< tag"><6-im fdivgl=EN-USop ef(x -im e6 w .r>> -im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e) w .r>> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e﹣ -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e) w .r>> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,故函数> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop ef(x)> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e在定义域(> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e0> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,a"-im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e+> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e∞)上为单调增函数。> -im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6 pr> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e≤> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e f t>> im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,得 -im e6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e≤> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e,因此 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e< -im e6 prx> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e< tag">< -im e6 w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e⑴ -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e< -im e6 prx-3 w .r>> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e>> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6-im f?pd=bl"mso--imcerun: yesom" r< w .r>> -im e6 -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e⑵ -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6-im f?pd=bl"mso--imcerun: yesom" rtag">< -im e6-im f?pd=bl"mso--imcerun: yesom" rtag">< -im e6-im f?pd=bl"mso--imcerun: yesom" rtag">< -im e6 w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e联立⑴,⑵,⑶ -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op r> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e求得 -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e3 w .r>> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e< -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop ex> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e≤> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e4,故不等式的解集为:﹛x|3<x ≤ 4﹜> pr> -im e6-im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e≤> -im >6-im f?pd=blow .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e6w .r fref="Times N=" Romanop e46-im f?pd=bl"mso--imcerun: yesom" rtag">< -im e6 w .r>> -im f?pd=bl'w .refamily: 黑体; w .reheigh;te.5pto w .reweidc1: s.rmal; mso-;ixii-w .refamily: "Times N=" Roman"; mso-tycsi-w .refamily: "Times N=" Roman";'p e⑶ -im e6-im f?pd=bl"w .reheigh;te.5pto w .reweidc1: s.rmal;op divgl=EN-USop e< -im e6 pr> div>
> div>
> div> >div>