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外項二個數分別為:(37+13)÷2=25和(37-13)÷2=12 比值為2.4 即:25:(25×12/5)=(12÷12/5):12 25:60=5:12 驗算:25×12=300;60×5=300 比例內項之積等於外項之積,囙此此比例式成立
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