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前面的好像都錯啦,這題沒有定值!84+136=220兩個二班.一班和三班的人數136-84=52三班比1班多52人220人中,除了3班和1班的,還有兩個2班,這兩個2班的占全年級人數的一半,兩個2班的人數最少為220/2=110人,二班人數最…
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