题目内容
化简:
(1)5
+
-7
(2)(
+
)2(5-2
).
(1)5
| 2 |
| 8 |
| 18 |
(2)(
| 2 |
| 3 |
| 6 |
(1)原式=5
+2
-7×3
=7
-21
=-14
;
(2)原式=(5+2
)(5-2
)
=52-(2
)2
=25-24
=1.
| 2 |
| 2 |
| 2 |
=7
| 2 |
| 2 |
=-14
| 2 |
(2)原式=(5+2
| 6 |
| 6 |
=52-(2
| 6 |
=25-24
=1.
练习册系列答案
相关题目