题目内容
计算:
(1)(
+
)÷
;
(2)(2
-3
)(3
+2
).
(1)(
| 27 |
| 18 |
| 3 |
(2)(2
| 2 |
| 3 |
| 3 |
| 2 |
(1)(
+
)÷
,
=(3
+3
)÷
,
=3+
,
=3+
;
(2)(2
-3
)(3
+2
),
=(2
)2-(3
)2,
=8-27,
=-19.
| 27 |
| 18 |
| 3 |
=(3
| 3 |
| 2 |
| 3 |
=3+
3
| ||
|
=3+
| 6 |
(2)(2
| 2 |
| 3 |
| 3 |
| 2 |
=(2
| 2 |
| 3 |
=8-27,
=-19.
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