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xy(X+Y+Z)*0.3=2.7X/0.4=YZ*0.4=Y求

2006-10-29 16:25:26z***
(X+Y+Z)*0.3=2.7 X/0.4=Y Z*0.4=Y 求X=? Y=? Z=? xy(X+Y+Z)*0.3=2.7X/0.4=YZ*0.4=Y求X=?Y=?Z=??

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