题目内容
(1)计算:(-2)2×5+|π-1|-
.
(2)化简:
+
-
.
| 9 |
(2)化简:
| 4 |
| a2-4 |
| 2 |
| a+2 |
| 1 |
| a-2 |
(1)原式=4×5+(π-1)-3
=20+π-1-3
=16+π;
(2)原式=
+
-
=
=
=
.
=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 |
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