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比較數量應用題：四年級有學生多少人？
Forfatter
Anthony OR 柯志明
某學校二年級有學生 53 人，二年級學生比三佃級學生少 14 人，三年級學生比四年級學生多 18 人。四年級有學生多少人？
GeoGebra
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