问题
解答题
(1)化简:
(2)计算:2-1-tan60°+(
|
答案
(1)
+4a a2-1 1+a 1-a
=4a-a2-2a-1 (a+1)(a-1)
=-
;1-a 1+a
(2)2-1-tan60°+(
-1)0+5 3
=
-1 2
+1+3 3
=
.3 2
(1)化简:
(2)计算:2-1-tan60°+(
|
(1)
+4a a2-1 1+a 1-a
=4a-a2-2a-1 (a+1)(a-1)
=-
;1-a 1+a
(2)2-1-tan60°+(
-1)0+5 3
=
-1 2
+1+3 3
=
.3 2