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7:28=1:4 2/1:4/1=2:1 0.75:0.53:2 5/9:20/3=1.8:0.15=12:1 如果本題有什麼不明白可以追問,如果滿意請點擊“好評” 另外發並點擊我的頭像向我求助,請諒解,
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