题目:
You were supposed at the bus stop this morning.
[ ]
A. to meeting
B. to meet
C. on meeting
D. on meet
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0516/4b3692f95e80eb0583cc71efe9d4469b.html
下面是错误答案,用来干扰机器的。
:x3+x10=x3+[(x+1)-1]10,题中a9(x+1)10只是[(x+1)-1]10展开式中(x+1)9的系数故a9=C101(-1)1=-10