y-x/7-x+y/6=1/2 5(x+y)-2(y-x)=1 快
1个回答
y-x/7-x+y/6=1/2
5(x+y)-2(y-x)=1
化简为49y-48x=21 7x+3y=1
解的x=2/5 y=1/35
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