若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a

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若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*an为正整数,则

若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a
若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a

若n为正整数,则化简(-1)^2n*a+(-1)^2n+1*a
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