若3x-2y=7,则6-6x+4y=

若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 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7x+6(x-y)=-4,3x-4(y-x)=18,则x-y=__ {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²= 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方= 若集合A={(x,y)|4x+y=6},B={(x,y)|3x+2y=7},则集合A∩B= 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 若（2X+3y)=4则7(2x+3y)-5(2x+3y)-4(2x=3y）的值为（ ） 若（X+Y)=2则7（X+Y)-6(X+Y)-4(X+Y)+5(x+y)=（ ） 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)=