题目内容
计算:(1)(
+
)-(
-
+
)(2)
•3
÷(-
)
| 27 |
|
| 12 |
|
| 45 |
4
|
| 5 |
| 3 |
| 4 |
| 10 |
(1)原式=(3
+
)-(2
-
+3
)
=
-
;
(2)原式=
•3
•(-
)
=-
.
| 3 |
| ||
| 3 |
| 3 |
| ||
| 5 |
| 5 |
=
| 4 |
| 3 |
| 3 |
| 14 |
| 5 |
| 5 |
(2)原式=
2
| ||
| 5 |
| 5 |
| 4 | ||
3
|
=-
| 8 |
| 5 |
| 15 |
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