原式=(x-y)^3*(y-x)^4/(y-x)^3/(x-y)
=(x-y)^7/(x-y)^3/(x-y)
=(x-y)^4/(x-y)
=(x-y)^3
计算题 :(x-y)的3次方乘以(y-x)的4次方除以(y-x)的3次方除以(x-y)
计算题 :(x-y)的3次方乘以(y-x)的4次方除以(y-x)的3次方除以(x-y)
数学人气：640 ℃时间：2019-08-21 23:17:32
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