试题与答案

You were supposed at the bus stop this

题型:选择题

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:

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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

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