问题
选择题
等差数列{an}、{bn}的前n项的和分别记为An、Bn,若
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答案
∵等差数列{an}和{bn}的前n项和分别为An、Bn,
=An Bn 2n 3n+1
=a10 b10
=A19 B19
=38 58 19 29
故选C.
等差数列{an}、{bn}的前n项的和分别记为An、Bn,若
|
∵等差数列{an}和{bn}的前n项和分别为An、Bn,
=An Bn 2n 3n+1
=a10 b10
=A19 B19
=38 58 19 29
故选C.