Question

约分:(a-x)的平方除以(x-3)的立方 约分:x的平方减4除以xy+2y 两题原题目都是分式

Answer 1

(a-x)的平方除以(x-a)的立方
=(x-a)²/(x-a)³
=1/(x-a)

x的平方减4除以xy+2y
=(x²-4)/(xy+2y)
=(x-2)(x+2)/y(x+2)
=(x-2)/y

Answer 2

(x^2-4)/(xy+2y)=(x+2)(x-2)/{(x+2)*y}=(x-2)/y
(a-x)^2/(x-3)^3={(x-2)^2/(x-3)^2}/(x-3)=(1+(3-a/)(x-3))/(x-3)