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B-A=1/2 A=B-1/2 B-C=7/18 C=B-7/18 代入A+B+C=10/9 B-1/2+B+B-7/18=10/9 3B=2 B=2/3 A=B-1/2=1/6 C=B-7/18=5/18
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