问题
解答题
计算: (1)(-
(2)1-
|
答案
(1)原式=-2-
+1+23 3
=-1+
;3
(2)原式=1-
÷a-1 a (a+1)(a-1) a(a+2)
=1-
×a-1 a a(a+2) (a+1)(a-1)
=1-a+2 a+1
=a+1-a-2 a+1
=
.-1 a+1
计算: (1)(-
(2)1-
|
(1)原式=-2-
+1+23 3
=-1+
;3
(2)原式=1-
÷a-1 a (a+1)(a-1) a(a+2)
=1-
×a-1 a a(a+2) (a+1)(a-1)
=1-a+2 a+1
=a+1-a-2 a+1
=
.-1 a+1