题目内容
口算:
| 75+25= | 808-108= | 730-230= | 570+100= | 84-25=1 | 50+70= |
| 75+25=100, | 808-108=700, | 730-230=500, | 570+100=670, | 84-25=59, | 50+70=120, |
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题目内容
| 75+25= | 808-108= | 730-230= | 570+100= | 84-25=1 | 50+70= |
| 75+25=100, | 808-108=700, | 730-230=500, | 570+100=670, | 84-25=59, | 50+70=120, |