巧算:87.4-(43.27-22.6)-9.73
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巧算:87.4-(43.27-22.6)-9.73
巧算:87.4-(43.27-22.6)-9.73
巧算:87.4-(43.27-22.6)-9.73
去括号得87.4-43.27+22.6-9.73
等于87.4+22.6-(43.27+9.73)
=110-53=57
巧算:87.4-(43.27-22.6)-9.73
巧算 87.4-(43.27-22.6)-9.73
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