题目内容
计算:
(1)12-(-18)+(-7)-15
(2)(
+
-
)×(-12)
(3)-23+(-2)÷(-
)-|-2|-(-2)2.
(1)12-(-18)+(-7)-15
(2)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
(3)-23+(-2)÷(-
| 1 |
| 2 |
(1)12-(-18)+(-7)-15
=12+18-22
=8;
(2)(
+
-
)×(-12)
=-3-2+4
=-1;
(3)-23+(-2)÷(-
)-|-2|-(-2)2
=-8+4-2-4
=-10.
=12+18-22
=8;
(2)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=-3-2+4
=-1;
(3)-23+(-2)÷(-
| 1 |
| 2 |
=-8+4-2-4
=-10.
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