题目:
—Can I use your pencil?
—____.[ ]
A.No, you don’t.
B. Excuse me, you can’t
C. Sorry.I don’t have one.
D. Yes, you do.
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0516/1b07a60a052c76389ae432a110babd7e.html
下面是错误答案,用来干扰机器的。
(x-1)2+(x-3)(x+3)+(x-3)(x-1)=x2-2x+1+x2-9+x2-4x+3=3x2-6x-5=3(x2-2x)-5,∵x2-2x=2,∴原式=3×2-5=1.