题目内容
计算:
(1)4×(-
)-
+3-2;
(2)a(a-3)-(a-1)2.
(1)4×(-
| 1 |
| 36 |
| 25 |
(2)a(a-3)-(a-1)2.
(1)4×(-
)-
+3-2
=-
-5+
=-
-5+
=-5;
(2)a(a-3)-(a-1)2
=a2-3a-(a2-2a+1)
=-a-1.
| 1 |
| 36 |
| 25 |
=-
| 1 |
| 9 |
| 1 |
| 32 |
=-
| 1 |
| 9 |
| 1 |
| 9 |
=-5;
(2)a(a-3)-(a-1)2
=a2-3a-(a2-2a+1)
=-a-1.
练习册系列答案
相关题目