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25x24%2.8x5/7筒算快快快

25x24-2.8x5/7 =25×8×3-2 =600-2 =598

原式 =32x53-32x3 =32x(53-3) =32x50 =16x2x50 =16x100 =1600

22x5÷2 =110÷2 =55

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