题目

1.将下列各式通分
(1) (2)
1 3 y+3 1 y-1
_____ ,______ _________ ,_________,___________
a2-2a a2-4 y2-6y+9 2y+6 y2-9

提问时间：2021-02-09

答案

(a+2)/a(a²-4);3a/a(a²-4);
2(y+3)²/2(y-3)²(y+3);(y-3)²/2(y-3)²(y+3);2(y-1)(y-3)/2(y-3)²(y+3);