题目内容
脱式计算.
(1)0.25×
+2.5%
(2)9.6-11÷7+
×4
(3)12×[(
-
)×3].
(1)0.25×
| 4 |
| 5 |
(2)9.6-11÷7+
| 1 |
| 7 |
(3)12×[(
| 11 |
| 6 |
| 2 |
| 3 |
(1)0.25×
+2.5%,
=0.25×0.8+0.025,
=0.2+0.025,
=0.225;
(2)9.6-11÷7+
×4
=9.6-11×
+
×4,
=9.6-(11-4)×
,
=9.6-7×
,
=9.6-1,
=8.6;
(3)12×[(
-
)×3].
=12×[(
-
)×3],
=12×[
×3],
=12×
,
=42.
| 4 |
| 5 |
=0.25×0.8+0.025,
=0.2+0.025,
=0.225;
(2)9.6-11÷7+
| 1 |
| 7 |
=9.6-11×
| 1 |
| 7 |
| 1 |
| 7 |
=9.6-(11-4)×
| 1 |
| 7 |
=9.6-7×
| 1 |
| 7 |
=9.6-1,
=8.6;
(3)12×[(
| 11 |
| 6 |
| 2 |
| 3 |
=12×[(
| 11 |
| 6 |
| 4 |
| 6 |
=12×[
| 7 |
| 6 |
=12×
| 7 |
| 2 |
=42.
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