题目内容
计算:
(1)-17+49-9+7;
(2)(-6)2×(
-
)-23;
(3)
-
+
;
(4)-7
×60(用简便方法计算);
(5)(-30)×(
-
+
).
(1)-17+49-9+7;
(2)(-6)2×(
| 2 |
| 3 |
| 1 |
| 2 |
(3)
| 3 | -64 |
| 25 |
|
(4)-7
| 13 |
| 15 |
(5)(-30)×(
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 5 |
(1)原式=56-26
=30;
(2)原式=36×
-8
=6-8
=-2;
(3)原式=-7×60-
×60
=-420-52
=-472;
(5)原式=-30×
-30×(-
)-30×
=-15+20-24
=-19.
=30;
(2)原式=36×
| 1 |
| 6 |
=6-8
=-2;
(3)原式=-7×60-
| 13 |
| 15 |
=-420-52
=-472;
(5)原式=-30×
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 5 |
=-15+20-24
=-19.
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