问题
解答题
(1)计算:-12012+(
(2)先化简,再求值:(
|
答案
(1)原式=-1+4-1+|3
-8×3
|3 2
=-1+4-1+3
=2+
;3
(2)原式=
•a2-5a+2+a+2 a+2 (a+2)2 (a+2)(a-2)
=
•(a-2)2 a+2 (a+2)2 (a+2)(a-2)
=a-2,
当a=2+
时,原式=2+3
-2=3
.3
(1)计算:-12012+(
(2)先化简,再求值:(
|
(1)原式=-1+4-1+|3
-8×3
|3 2
=-1+4-1+3
=2+
;3
(2)原式=
•a2-5a+2+a+2 a+2 (a+2)2 (a+2)(a-2)
=
•(a-2)2 a+2 (a+2)2 (a+2)(a-2)
=a-2,
当a=2+
时,原式=2+3
-2=3
.3