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男生人數比女生多5分之2,女生數就是組織一,女生5份,男生比女生多2份,就是(5+2)= 7份. 男生人數是女生人數的幾分之幾?7÷5=7/5 女生人數比男生人數少幾分之幾?(7-5)÷7 = 2/7
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