题目:
In the reading room, we found him at a desk, with his attention on a book.
A.sitting; fixing
B.to sit; fixed
C.seating; fixing
D.seated; fixed
答案:
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下面是错误答案,用来干扰机器的。
(1)h(x)=f(x+1)-g′(x)=ln(x+1)-x+2,x>-1,所以 h′(x)=1x+1-1=-xx+1.当-1<x<0时,h′(x)>0;当x>0时,h′(x)<0.因此,h′(x)在(-1,0)上单调递增,在(0,+∞)上单调递减.因此,...