(x-y)的7次方除以(y-x)的6次方+(-x-y)的3次方除以(x+y)的2次方 等于?

问题描述:

(x-y)的7次方除以(y-x)的6次方+(-x-y)的3次方除以(x+y)的2次方 等于?

(x-y)的7次方除以(y-x)的6次方+(-x-y)的3次方除以(x+y)的2次方
=(x-y)的7次方÷(x-y)的6次方-(x+y)³÷(x+y)²
=x-y-(x+y)
=-2y