(x-y)的3次方乘(y-x)的4次方乘(y-x)的七次方是多少?要过程.立刻要,好的在追分.

2024-11-16 06:43:45
推荐回答(1个)
回答1:

(x-y)^3*(y-x)^4*(y-x)^7
=(x-y)^3*(x-y)^4*[-(x-y)]^7
=-(x-y)^(3+4+7)
=-(x-y)^14