题目内容
计算:(1)5×(-2)-90÷(-15);
(2)-1
+
+
;
(3)(1
-
-
)×(-
);
(4)-14-(1-0.5)÷3×[3-(-3)2].
(2)-1
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
(3)(1
| 3 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 8 |
| 7 |
(4)-14-(1-0.5)÷3×[3-(-3)2].
(1)原式=-10+6=-4;
(2)原式=-1
+
=-1;
(3)原式=-2+1+
=-
;
(4)原式=-1-
×
×(3-9)=-1-(-1)=0.
(2)原式=-1
| 1 |
| 2 |
| 1 |
| 2 |
(3)原式=-2+1+
| 2 |
| 3 |
| 1 |
| 3 |
(4)原式=-1-
| 1 |
| 2 |
| 1 |
| 3 |
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