题目内容
7.2×61
+73.8×2
=______．
| 3 |
| 10 |
| 4 |
| 5 |
7.2×61
+73.8×2
，
=7.2×61.3+（61.3+12.5）×2.8，
=（7.2+2.8）×61.3+12.5×2.8，
=613+35，
=648．
| 3 |
| 10 |
| 4 |
| 5 |
=7.2×61.3+（61.3+12.5）×2.8，
=（7.2+2.8）×61.3+12.5×2.8，
=613+35，
=648．
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