问题
解答题
(1)先化简,再求值:
(2)计算(
|
答案
(1)原式=
+1 a+2 4 (a+2)(a-2)
=a+2 (a+2)(a-2)
=
,1 a-2
当a=4+
时,原式=2-3
;3
(2)原式=1-|
-1|-(3 2
-1)-13
=-
.3 2
(1)先化简,再求值:
(2)计算(
|
(1)原式=
+1 a+2 4 (a+2)(a-2)
=a+2 (a+2)(a-2)
=
,1 a-2
当a=4+
时,原式=2-3
;3
(2)原式=1-|
-1|-(3 2
-1)-13
=-
.3 2