已知函数f(x)=x^2+ax+a/x,且a
人气:121 ℃ 时间:2019-09-09 11:36:14
解答
设在x∈[1,+∞)上任取两点x1,x2,且x1>x2>=1f(x1)-f(x2)=[(x1)^2+ax1+a]/x1-[(x2)^2+ax2+a]/x2f(x1)-f(x2)={x2[(x1)^2+ax1+a]-x1[(x2)^2+ax2+a]}/x1x2f(x1)-f(x2)=[x2(x1)^2-x1(x2)^2+ax2-ax1]/x1x2f(x1)-f(x2)=[x1x2...
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