摘要:1.720÷ =720÷ =720÷24 =30 ( )
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| 720-720÷15 | 85×101-85 | 355+260+140+245 |
| 4000÷25 | 367-144÷24×13 | 16×15×125 |
| 645-180-245 | 175×56+25×56 | 204×(38+405÷27) |