若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a
人气:179 ℃ 时间:2020-05-13 21:08:28
解答
n为正整数,则2n是偶数,2n+1是奇数.
(-1)^2n*a+(-1)^2n+1*a
=1*a-1+1*a
=2a-1
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