题目内容
(1)计算:4-5-(-6)-(-7);
(2)计算:(-
-
+
)×36.
(2)计算:(-
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 12 |
(1)4-5-(-6)-(-7)
=4-5+6+7
=12;
(2)(-
-
+
)×36
=36×(-
)+36×(-
)+36×
=-27+(-30)+21
=-36.
=4-5+6+7
=12;
(2)(-
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 12 |
=36×(-
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 12 |
=-27+(-30)+21
=-36.
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