题目内容
计算:
(1)-2-(-3)+(-8)
(2)20.4×(-
)+(-6)
(3)(
+
-
)÷(-
)+(-
)
(4)18-6÷(-2)×|-
|
(5)-14-
×[2-(-3)2]
(6)
÷[2
-(-1+2
)]×0.4.
(1)-2-(-3)+(-8)
(2)20.4×(-
| 3 |
| 2 |
(3)(
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 7 |
| 8 |
| 8 |
| 3 |
(4)18-6÷(-2)×|-
| 1 |
| 4 |
(5)-14-
| 1 |
| 6 |
(6)
| 1 |
| (-0.2)2 |
| 1 |
| 2 |
| 1 |
| 4 |
(1)原式=-2+3-8=-7;
(2)原式=(20+
)×(-
)-6=-30-
-6=-36.6;
(3)原式=(-
+
-
)×(-
)-
=2-1+
-
=-1;
(4)原式=18-6×(-
)×
=18+
=18
;
(5)原式=-1-
×(2-9)=-1+
=
;
(6)原式=25÷(
+1-
)×
=25×
×
=8.
(2)原式=(20+
| 2 |
| 5 |
| 3 |
| 2 |
| 3 |
| 5 |
(3)原式=(-
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 8 |
| 7 |
| 8 |
| 3 |
| 2 |
| 3 |
| 8 |
| 3 |
(4)原式=18-6×(-
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
(5)原式=-1-
| 1 |
| 6 |
| 7 |
| 6 |
| 1 |
| 6 |
(6)原式=25÷(
| 5 |
| 2 |
| 9 |
| 4 |
| 2 |
| 5 |
=25×
| 4 |
| 5 |
| 2 |
| 5 |
=8.
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