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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