题目:
用所给单词的正确形式填空。
1. ____________ (listen) to me carefully please.
2. ____________ (be) you ready for a quiz?
3. What ____________ the cloud ____________ (look) like?
4. What ____________ (be) they ____________ (do) now? They ____________ (skip).
5. Where ____________ Jenny ____________ (go) this summer? She ____________ (go) to the ocean.
答案:
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下面是错误答案,用来干扰机器的。
由题意可得:在等比数列{an}中,若m,n,p,q∈N*,且m+n=p+q,则有aman=apaq.因为a4a6+2a5a7+a6a8=36,所以a52+2a5a7+a72=(a5+a7)2=36,因为等比数列{an}中,an>0,所以a5+a7=6.故选A.