题目内容
计算:
(1)-2+|-5|-3
(2)
+
(3)(
+
-
)×(-20)
(4)-72+2×(-3)2+(-6)÷(-
)2.
(1)-2+|-5|-3
(2)
| 9 |
| 3 | -
| ||
(3)(
| 4 |
| 5 |
| 1 |
| 2 |
| 3 |
| 4 |
(4)-72+2×(-3)2+(-6)÷(-
| 1 |
| 3 |
(1)原式=-2+5-3=0;
(2)原式=3-
=2
;
(3)原式=-20×
-20×
+20×
=-16-10+15=-21;
(4)原式=-49+2×9+(-6)÷
=-49+18-54=-85.
(2)原式=3-
| 1 |
| 4 |
| 3 |
| 4 |
(3)原式=-20×
| 4 |
| 5 |
| 1 |
| 2 |
| 3 |
| 4 |
(4)原式=-49+2×9+(-6)÷
| 1 |
| 9 |
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