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設六一班應調x人給六二班,則六一班為(55-x)人,六二班為(57+x)人,所以 (55-x):(57+x)=7:9 即(55-x)=7(57+x) 495-9x=399+7x 7x+9x=495-399 16x=96 x=6 答:六一班應調6人給六二班
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