题目内容
计算:
(1)12-(-18)+(-7)-15;
(2)(-
+
-
)×(-12);
(3)42÷[(-2)2-(-5)×(-2)];
(4)-14-
×[2-(-3)2].
(1)12-(-18)+(-7)-15;
(2)(-
| 1 |
| 6 |
| 3 |
| 4 |
| 5 |
| 12 |
(3)42÷[(-2)2-(-5)×(-2)];
(4)-14-
| 1 |
| 6 |
(1)原式=12+18-7-15=30-22=8;
(2)原式=(-
)×(-12)+
×(-12)-
×(-12)=2-9+5=-2;
(3)原式=42÷(4-10)=42÷(-6)=-7;
(4)原式=-1-
×(2-9)=-1-
×(-7)=-1+
=
.
(2)原式=(-
| 1 |
| 6 |
| 3 |
| 4 |
| 5 |
| 12 |
(3)原式=42÷(4-10)=42÷(-6)=-7;
(4)原式=-1-
| 1 |
| 6 |
| 1 |
| 6 |
| 7 |
| 6 |
| 1 |
| 6 |
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