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根據三個年級的比例關係1:1.5:2得出比例之和為1+1.5+2=4.5 4年級人數:360*1/4.5=80(人) 5年級人數:360*1.5/4.5=120(人) 6年級人數:360*2/4.5=160(人)或360-80-120=160(人). 答:光明小學4年級有80人,5年級有120人,6年級有160人.
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