9x+2y=62.4x+3y=36.求x,y

9x+2y=62.4x+3y=36.求x,y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y y=3(x-y),x=2(x-y)求x,y的值 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 已知2x-y/x+2y=3,求2(2x-y)/x+2y-9(x+2y)/2x-y+3的值. 已知:3x-5y=0,求x/y,x-y/y,x-y/x {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 3x=2y+1;x=9y;求x,y的值? 已知,X:Y=3:2,求代数式4X-9Y:2X+3Y 已知x/y=3/2求代数式4x-9y/2x+3y 若／X+Y-9／+（2X-Y+3)=0求X与Y的值 已知：x+9y=y-3x,求(x^2-y^2)/(x^2+y^2)的值RT