题目内容
计算:
(1)(
+
)-(
-
+
)
(2)(
+
-1)(
-
+1).
(1)(
| 27 |
|
| 12 |
|
| 45 |
(2)(
| 2 |
| 3 |
| 2 |
| 3 |
(1)原式=3
+
-2
+
-3
=
-
;
(2)原式=(
)2-(
-1)2
=2-(3-2
+1)=2
-2.
| 3 |
| 1 |
| 3 |
| 3 |
| 3 |
| 1 |
| 5 |
| 5 |
| 5 |
| 4 |
| 3 |
| 3 |
| 14 |
| 5 |
| 5 |
(2)原式=(
| 2 |
| 3 |
=2-(3-2
| 3 |
| 3 |
练习册系列答案
相关题目