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利用餘數來解决這一類問題,把5朵紅花,9朵黃花,13朵綠花看做一組. 249÷(5+9+13)=9(組)···6(朵)這一步是求一共有幾組,還剩餘幾朵花,得出9組還剩餘6朵花,除9組外剩餘的六朵分別為:紅,紅,紅,紅,紅,黃.第6朵正好是黃花.
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