摘要： 计算:2 + 4 + 6 + 8 + 10 + 12 + ┅┅ + 26 = .
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| 用递等式计算，能简算的要简算． 1.25×32×2.5 |
86.5×2.4÷0.3-690 | ||||||||||
| 18.75-6.2-3.8 | 3.7×7.3+7.3×6.3 | ||||||||||
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0.4×7+
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| 用简便方法计算下面各题 1．Ol×6.3 | 2.18×3.12+6.88×2.18 |
| 4.4×25 | 0.25×39+0.25 |
| 0.8×5.67×12.5 | 4.4×3.8+6.6×3.8-3.8 |
| 8.6×102 | （0.2+4）×25 |
| 12.5×32×0.25． |