已知数列{an}满足[2﹣（﹣1）n]an+[2+（﹣1）n]an+1=1+（﹣1）n×3n，则a25﹣a1=_1．_刷题宝

题干

已知数列{a_n}满足[2﹣（﹣1）ⁿ]a_n+[2+（﹣1）ⁿ]a_n₊₁=1+（﹣1）ⁿ×3n，则a₂₅﹣a₁=____．

上一题下一题 0.0难度选择题更新时间:2018-07-16 05:36:56

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