题目内容
| 5c×7c= | 4c×4c= | 25×4c= | 46c×4= |
| 6c×4c= | 2cc×7= | 42×4c= | 22×4= |
| 25×2c= | 48×2c= | 4cc×5= | 48c×5= |
| 485×4≈ | 454×28≈ | 592×24≈ | 4c8×44≈ |
| z0×了0=kz00 | 40×k0=5400 | 4z×40=5000 | 560×k=4800 |
| 60×40=4400 | 400×了=5400 | 54×k0=k60 | 44×4=88 |
| 4z×40=z00 | 48×40=960 | k00×z=5z00 | 580×z=900 |
| 58z×4≈800 | 5z4×48≈4z00 | z94×45≈54000 | 508×k4≈k400. |
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