Question

化成最简分式：

Answer 1

1、原式=(x-y)(x+2y)/(x+2y)(x-3y)=(x-y)/(x-3y)

2、原式=2（xy-2）/(xy-2)(xy+5)=2/(xy+5)

3、原式=(x+2y)(2x-3y)/(2x-3y)(3x+y)=(x+2y)/(3x+y)

4、原式=-(x+2)(x-2)/(x-2)(y+1)=-(x+2)/(y+1)

愿对你有所帮助!