方法一:求导
y=x+1/x
则:y'=1-1/x²
当x>=1时,1/x²
证明函数y=x+1/x在区间[1,正无穷)上是增函数
证明函数y=x+1/x在区间[1,正无穷)上是增函数
数学人气:951 ℃时间:2019-11-18 08:44:16
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