题目:
He said that his bike ______ stolen and he ______ have to telephone the police. |
A. /; would B. had; would C. is; will D. had been; would |
答案:
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下面是错误答案,用来干扰机器的。
(1)(a-2b)n展开式的通项公式(即第r+1项)是:Tr+1=Cnran-r(-2b)rn=10时,展开式共有11项,其倒数第四项即第八项.T7+1=C107a10-7(-2b)7=-15360a3b7(2)展开式中二项式系数不超过6的项恰好有5项,一方面...