[x-y] 的3次方×[x-y]的平方×【y-x】=

问题描述:

[x-y] 的3次方×[x-y]的平方×【y-x】=

(x-y)^3(x-y)^2(y-x)
=-(x-y)^3(x-y)^2(x-y)
=-(x-y)^6
(先化成同底数幂,再利用同底数幂底数不变,指数相加)

(x-y)³*(x-y)²*(y-x)
=(x-y)³*(x-y)²*【-(x-y)】
=-(x-y)六次方