题目内容
计算
(1)(+12)+(-7)-(+15)
(2)(
-
+
)×(-36)
(3)(-81)÷
×
÷(-
)
(4)-14-
×[3-(-3)2]×(-2)
(1)(+12)+(-7)-(+15)
(2)(
| 7 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
(3)(-81)÷
| 9 |
| 4 |
| 4 |
| 9 |
| 1 |
| 36 |
(4)-14-
| 1 |
| 6 |
(1)原式=12-7-15
=5-15
=-10;
(2)原式=
×(-36)-
×(-36)+
×(-36)
=-28+30-27
=-25;
(3)原式=(-81)×
×
×(-36)
=(-36)×
×(-36)
=(-16)×(-36)
=576;
(4)原式=-14-
×[3-9]×(-2)
=-14-
×(-6)×(-2)
=-1+1×(-2)
=-1-2
=-3.
=5-15
=-10;
(2)原式=
| 7 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
=-28+30-27
=-25;
(3)原式=(-81)×
| 4 |
| 9 |
| 4 |
| 9 |
=(-36)×
| 4 |
| 9 |
=(-16)×(-36)
=576;
(4)原式=-14-
| 1 |
| 6 |
=-14-
| 1 |
| 6 |
=-1+1×(-2)
=-1-2
=-3.
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