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設AQ=a PB=b (a+3):b=3:2 3b=2a+6 a:(3+b)=3:4 4a=9+3b 3b=4a-9 所以 2a+6=4a-9 2a=15 a=15/2 b=7 線段AB的長為 15/2+3+7 =17.5
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