问题
解答题
计算: (1)
(2)
|
答案
(1)原式=
+a(a-1) a2-1 a-1 a2-1
=a2-a+a-1 a2-1
=a2-1 a2-1
=1;
(2)原式=
•x-y x+3y
-(x+3y)2 (x+y)(x-y) 2y x+y
=
-x+3y x+y 2y x+y
=x+y x+y
=1.
计算: (1)
(2)
|
(1)原式=
+a(a-1) a2-1 a-1 a2-1
=a2-a+a-1 a2-1
=a2-1 a2-1
=1;
(2)原式=
•x-y x+3y
-(x+3y)2 (x+y)(x-y) 2y x+y
=
-x+3y x+y 2y x+y
=x+y x+y
=1.