(1).a/b÷a/b=(2).x-y/a+b·a-(1).a/b÷a/b=(2).x-y/a+b·a-b/y-x=(3).(-3ab/4c)²=

Question

(1).a/b÷a/b= (2).x-y/a+b·a-
(1).a/b÷a/b= (2).x-y/a+b·a-b/y-x= (3).(-3ab/4c)²=

Answer 1

(1) 1
(2) a+b/a-b
(3) 9a²b²/16c²