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3.15x2.8竖式计算并验算

3.15x2.8竖式计算并验算 3.15×2.8=8.820 验算: 8.82/3.15=2.8

15.5×2.8×3.2 =15.5×(2.8×3.2) =15.5×[(3-0.2)×(3+0.2)] =15.5×(9-0.04) =15.5×8.96 =138.88

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