题目内容
| 13×8= | 3900÷3= | 100-57= | 2+72×2= | 50÷7= |
| 280÷7= | 5×1200= | 54+19= | 80-40÷2= | 405×5= |
| 13×8=104, | 3900÷3=1300, | 100-57=43, | 2+72×2=146, | 50÷7=7…1, |
| 280÷7=40, | 5×1200=6000, | 54+19=73, | 80-40÷2=60, | 405×5=2025. |
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