(x-y)的3次方乘(y-x)的4次方除以(y-x)的3次方再除以(x-y)等于多少?
问题描述:
(x-y)的3次方乘(y-x)的4次方除以(y-x)的3次方再除以(x-y)等于多少?
答
(x-y)的3次方×(y-x)的4次方÷(y-x)的3次方÷(x-y)
=(x-y)的3次方×(x-y)的4次方÷[-(x-y)的3次方]÷(x-y)
=-(x-y)的(3+4-3-1)
=-(x-y)的3次方