问题
解答题
(1)计算:(-2)2×5+|π-1|-
(2)化简:
|
答案
(1)原式=4×5+(π-1)-3
=20+π-1-3
=16+π;
(2)原式=
+4 (a+2)(a-2)
-2(a-2) (a+2)(a-2) a+2 (a+2)(a-2)
=4+2a-4-(a+2) (a+2)(a-2)
=a-2 (a+2)(a-2)
=
.1 a+2
(1)计算:(-2)2×5+|π-1|-
(2)化简:
|
(1)原式=4×5+(π-1)-3
=20+π-1-3
=16+π;
(2)原式=
+4 (a+2)(a-2)
-2(a-2) (a+2)(a-2) a+2 (a+2)(a-2)
=4+2a-4-(a+2) (a+2)(a-2)
=a-2 (a+2)(a-2)
=
.1 a+2