计算(x-y)^m(y-x)^2m+(y-x)^3m
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计算(x-y)^m(y-x)^2m+(y-x)^3m
计算(x-y)^m(y-x)^2m+(y-x)^3m
计算(x-y)^m(y-x)^2m+(y-x)^3m
(x-y)^m(y-x)^2m+(y-x)^3m
=(x-y)^m*(x-y)^2m+(y-x)^3m
=(x-y)^3m+(-1)^3m*(x-y)^3m
=(x-y)^3m*[1+(-1)^3m]
(1)m是奇数,上式=0
(2)m是偶数,上式=2(x-y)^3m
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