已知函數(shù)f(x)=1/a-1/x在區(qū)間[1/2,2]上的值域是[1/2,2],求a的值
已知函數(shù)f(x)=1/a-1/x在區(qū)間[1/2,2]上的值域是[1/2,2],求a的值
數(shù)學人氣:662 ℃時間:2020-06-24 06:11:54
優(yōu)質(zhì)解答
無論a為何值,f(x)為減函數(shù),所以當x=1/2時,取最大值即f(x)=2,解得a=2/5,當x=2時,取最小值即f(x)=1/2,解得a=2/5,綜上a=2/5
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