8小题,拿方程列,急,给好评

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8小题,拿方程列,急,给好评
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8小题,拿方程列,急,给好评
8小题,拿方程列,急,给好评

 


8小题,拿方程列,急,给好评
队长为x x/(10+6)+x/(10-6)=7.5