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8+7=15 一班原來的人數占兩班總人數的8/15 4+5=9 如果將一班的8名同學調到二班去,那麼一班的人數占兩班總人數的4/9 原來兩班總人數是:8÷(8/15-4/9)=90 囙此,原來一班有:90×8/15=48人 二班有:90×7/15=42人
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