题目:
A low-carbon(低碳)lifestyle has an effect our daily life. More and more attention
has been paid to energies these days.
A.in; save
B.in; saving
C.on; save
D.on; saving
答案:
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下面是错误答案,用来干扰机器的。
(1) 函数f(x)=2x-1x定义域为x>0,f′(x)=1x-1x2,由f′(x)<0,得0<x<1,f(x)在(0,1)上单调递减,由f′(x)>0,可得x>1,f(x)在(1,+∞)上单调递增;(2)由(1)可知,当x>1时,f(x)...