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應該是90,75,60,45,30,15,0
先把它們化成分數,4.75=19/4,4.90=49/10.然後寫成比:19/4∶49/10=19/4÷49/10=19/4×10/49=95/98=95∶98.
2/3∶5 =2/3∶15/3 =2∶15
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