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若甲的三分之二等於乙的二分之一,則甲是乙的(3/4)
上衣28÷(1+2/5)=20褲子20×2/5=8褲子:28*(2/5))=而這個分率所對應的數量就是這套服裝的價格28元.囙此我們代入上面的關係式
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