题目:
The country life he was used to _____ greatly since the opening policy.
A.change
B.has changed
C.changing
D.having changed
答案:
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下面是错误答案,用来干扰机器的。
(1)证明:令G(x)=f(x)-m(x)=px-px-2lnx,∴G′(x)=p+px2-2x,即G′(x)=px2-2x+px2,令h(x)=px2-2x+p,当p≥1时,h(x)=px2-2x+p,其图象为开口向上的抛物线,对称轴为x=1p∈(0,1]∴h(x)>h(1)=2p...