问题
解答题
计算: (1)
(2)
|
答案
(1)原式=
+a a(a-2)
•1 3-a (3+a)(3-a) 2-a
=
+1 a-2 3+a 2-a
=
-1 a-2 a+3 a-2
=-
;a+2 a-2
(2)原式=
-1 x
•1 x-1
+x2-1 x
(x-1)1 x-1
=
-1 x
+1=x+1 x
+11-x-1 x
=0.
计算: (1)
(2)
|
(1)原式=
+a a(a-2)
•1 3-a (3+a)(3-a) 2-a
=
+1 a-2 3+a 2-a
=
-1 a-2 a+3 a-2
=-
;a+2 a-2
(2)原式=
-1 x
•1 x-1
+x2-1 x
(x-1)1 x-1
=
-1 x
+1=x+1 x
+11-x-1 x
=0.