题目内容
计算或化简
(1)
-
-
+
(2)(2
+
)(2
-
).
(1)
| 27 |
| 45 |
| 20 |
| 75 |
(2)(2
| 3 |
| 5 |
| 3 |
| 5 |
(1)原式=3
-3
-2
+5
=8
-7
;
(2)原式=(2
)2-(
)2
=12-5
=7.
| 3 |
| 5 |
| 5 |
| 3 |
=8
| 3 |
| 5 |
(2)原式=(2
| 3 |
| 5 |
=12-5
=7.
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题目内容
| 27 |
| 45 |
| 20 |
| 75 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 5 |
| 3 |
| 3 |
| 5 |
| 3 |
| 5 |