已知2x-y=4,则7-6x+3y=?
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已知(x-y)/13=y/7,则(x+y)/y=已知x/6=y/4=z/3(x,y,z均不为零),则(x+3y)/(3y-2z)=
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已知x+2y=3则x=? x-y=7则y=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知(3x+y+6)²+|x+y+2|=2,则x=,y=.
已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
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已知2x-y=4,则7-6x+3y=?
已知X和Y满足3X+4Y=2,X-Y-1/7