-n=-=--=-分数裂项求和方法总结(一)用裂项法求1n(n+1)型分数求和分析:因为11nn+1=n+1n(n+1)-=n(n+1)...
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名师精编优秀教案授课教案学员姓名:__________授课教师:_所授科目:学员年级:__________上课时间:___年__月_...
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求通项公式题型1:等差、等比数列通项公式求解已知:等差数列{an}中,a3+a4=15,a2a5=54,公差d<0,求数列{an}的通...
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