-2(x-y)^2n-4(y-x)^(2n+1)
=4(x-y)^(2n-1)-2(x-y)^2n
=2(x-y)^2n*(2x-2y-1)
希望能帮到你O(∩_∩)O好像不对哪里不对，2n-1是奇数(-1)^(2n-1)=-1是2n+1哦，写错了但结果一样-4(y-x)^(2n+1)=-4*[(-1)(x-y)]^(2n+1)=4(x-y)^(2n+1)从头完整的再写一遍可以么？