问题
选择题
在等差数列{an}中,公差为
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答案
由等差数列的性质可得 a2+a4+a6+…+a100 =a1+a3+a5+…+a99 +50d=60+50×
=85,1 2
故选D.
在等差数列{an}中,公差为
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由等差数列的性质可得 a2+a4+a6+…+a100 =a1+a3+a5+…+a99 +50d=60+50×
=85,1 2
故选D.
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