x*y=6x-y=1求X Y是多少?X=3 Y=2 求公式!

x*y=6x-y=1求X Y是多少?X=3 Y=2 求公式! X+Y=5 X*Y=6 求X,Y是多少,就是证明.X+Y=5 X*Y=6 求X,Y是多少, x+x+x+y+y=54,x+x+y+y=46求x,y是多少? Y=(240-X)*6 Y=(200-X)*10 求X,Y各是多少谢谢 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) 已知:3x-5y=0,求x/y,x-y/y,x-y/x 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 x.y都是自然数,且x(x-u)-y(y-x)+12,求x.y得值快1且x(x-y)-y(y-x)=12 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 Y-X*0.09=2500 求问Y、X是多少. x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x+2y=2x+y+1=7x-y 求：2x-y? x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)