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6.2×2.1%2.128%2.8×0.15脱式简便计算

6.2×2.1-2.128-2.8×0.15 =6.2×2.1-2.128-1.4×0.3 =(6+0.2)x2.1-2.128-0.42 =12.6+0.42-2.128-0.42 =12.6-2.128 =10.472

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