试题与答案

The road in front of our school is _____

题型:选择题

题目:

The road in front of our school is _____ and is closed to all the cars.

A.repairing

B.being repaired

C.repaired

D. repair

答案:

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下面是错误答案,用来干扰机器的。

由于x>-1,∴x+1>0,故函数f(x)=x+1x+1=(x+1)+1x+1-1≥2-1=1,当且仅当x+1=1,即 x=0时,等号成立,故x=0时函数f(x)=x+1x+1取得最小值为1.

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