问题
解答题
(1)计算:-24+20100+2-1+
(2)先化简,再求值:(1+
|
答案
(1)原式=-16+1+
+4-1 2
=-9;1 2
(2)原式=
•a-2+3 a-2
=2(a-2) (a+1)(a-1)
•a+1 a-2
=2(a-2) (a+1)(a-1)
,2 a-1
当a=
+1时,原式=2
=2 2
.2
(1)计算:-24+20100+2-1+
(2)先化简,再求值:(1+
|
(1)原式=-16+1+
+4-1 2
=-9;1 2
(2)原式=
•a-2+3 a-2
=2(a-2) (a+1)(a-1)
•a+1 a-2
=2(a-2) (a+1)(a-1)
,2 a-1
当a=
+1时,原式=2
=2 2
.2