题目内容
计算:
(1)
-
×30+8
(2)28×
-(-28)×0.5+28×(-
)
(3)(-1)+(1-
)÷3×(2-23).
(1)
| 5 |
| 2 |
| 7 |
| 10 |
| 1 |
| 2 |
(2)28×
| 3 |
| 4 |
| 1 |
| 4 |
(3)(-1)+(1-
| 1 |
| 2 |
(1)原式=2.5-21+8.5=-10;
(2)原式=28×(
+0.5-
)=28;
(3)原式=-1+0.5÷3×(2-8)
=-1+0.5÷3×(-6)
=-1-1
=-2
(2)原式=28×(
| 3 |
| 4 |
| 1 |
| 4 |
(3)原式=-1+0.5÷3×(2-8)
=-1+0.5÷3×(-6)
=-1-1
=-2
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