题目内容
计算:(-
)(4
)=______;
-
+
=______.
| 1 |
| 2 |
| 28 |
|
| (-5)2 |
| 4 |
| 3 | -15
| ||
(1)原式=(-
)(
)
=-(
×
)
=-
=-4
;
(2)原式=5-2-
=
.
| 7 |
4
| ||
| 7 |
=-(
| 7 |
4
| ||
| 7 |
=-
4
| ||
| 7 |
=-4
| 3 |
(2)原式=5-2-
| 5 |
| 2 |
=
| 1 |
| 2 |
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