摘要:(1) 12.56 (2) 25.12 (3) 6.28
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计算:
①-40-28-(-19)+(-24);
②-0.5-(-3
)+2.75-(+7
);
③(-5)×8×(-7)×(-0.25);
④(
-
+
-
-
)×(-24);
⑤[1-(1-0.5×
)]×[2-(-3)2].
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①-40-28-(-19)+(-24);
②-0.5-(-3
| 1 |
| 4 |
| 1 |
| 2 |
③(-5)×8×(-7)×(-0.25);
④(
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| 2 |
| 2 |
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| 5 |
| 4 |
| 5 |
| 6 |
| 3 |
| 8 |
⑤[1-(1-0.5×
| 1 |
| 3 |