若|5x+2y-12|+（3x+2y-6）（3x+2y-6）=0,则2x+4y=

若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若|5x+2y-12|+（3x+2y-6）（3x+2y-6）=0,则2x+4y= 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若5x+3y=3x+4y=x+2y+6,则x+y=___ 若|5x+2y-12|+（3x-2y-6）平方=0,则x+2y=? 已知x-5y=0(y≠0）,则代数式2x-3y/3x+6y 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1