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由已知可得: b=3a/2,d=3c/2,f=3e/2 代入2b-d+5f=8可得: 2*3a/2-3c/2+5*3e/2=8 左右同時乘以2,得 6a-3c+15e=16 左右同時除以3,得 2a-c+5e=16/3
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