题目内容
计算:39×
+148×
+48×
=______.
| 148 |
| 149 |
| 86 |
| 149 |
| 74 |
| 149 |
39×
+148×
+48×
,
=39×
+86×
+48×
,
=(39+86)×
+48×
=125×
+48×
,
=250×
+48×
=(250+48)×
,
=298×
,
=148.
| 148 |
| 149 |
| 86 |
| 149 |
| 74 |
| 149 |
=39×
| 148 |
| 149 |
| 148 |
| 149 |
| 74 |
| 149 |
=(39+86)×
| 148 |
| 149 |
| 74 |
| 149 |
=125×
| 148 |
| 149 |
| 74 |
| 149 |
=250×
| 74 |
| 149 |
| 74 |
| 149 |
=(250+48)×
| 148 |
| 149 |
=298×
| 74 |
| 149 |
=148.
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