题目内容
87×
+12÷
+40%
| 2 |
| 5 |
| 5 |
| 2 |
87×
+12÷
+40%
=87×
+12×
+40%,
=87×0.4+12×0.4+0.4,
=(87+12+1)×0.4,
=100×0.4,
=40.
| 2 |
| 5 |
| 5 |
| 2 |
=87×
| 2 |
| 5 |
| 2 |
| 5 |
=87×0.4+12×0.4+0.4,
=(87+12+1)×0.4,
=100×0.4,
=40.
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