题目内容
计算
(1)|2-
|+2
+(
+1)0
(2)a2(a-1)+(a-5)(a+7)
(1)|2-
| 2 |
| 2 |
| π |
| 2 |
(2)a2(a-1)+(a-5)(a+7)
(1)原式=2-
+2
+1
=3+
.
(2)原式=a3-a2+a2+7a-5a-35
=a3+2a-35.
| 2 |
| 2 |
=3+
| 2 |
(2)原式=a3-a2+a2+7a-5a-35
=a3+2a-35.
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