回复：谢谢诸位！第二题答案是E，但我还是不甚明白，烦请再说细点。

来源: ctrls 于 2009-12-22 07:38:35 [档案] [旧帖] [给我悄悄话] 阅读数 : 0 (188 bytes)

回答: 20) B; 21) E 由 BeLe 于 2009-12-21 20:19:38

21, k=-2 is obvious, since the whole graph shifts down by 2. To determine h is a little tricky. Think when x=2, g(x) = f(x+h)-2=f(2+h)-2=1, so f(2+h)=3, the same as f(-1). So 2+h=-1, h=-3