4X+3Y=9,、求二元方程式?

4X+3Y=9,、求二元方程式? 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 x(x-3y)=4y(x-3y),求x:y x/3=y/4,求(x*x-xy)/(x*x+y*y)的值 x^2+y^2=10,x-y=4,求x,y x+y=-5,xy=4,求x-y x+y=9,xyx^2+y^2=10,x-y=4,求x,y x+y=-5,xy=4,求x-yx+y=9,xy=10,求x^2+y^2,x^3+y^3,x^4+y^4 已知x,y满足{3x-y=9 {x-3y=0 求x+2y+ 4y的平方/x-2y -4x的平方y/x的平方-4y的平方 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y |X+Y-9+(2X-6)二次方=0|求 3X+4Y= 已知 |3x-2|+|9x-4y-2|=0,求x,y的值 /x/=3 /y/=4求x＋y X:2.5=Y:3/4 求X:Y 急 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. 已知实数x y满足x^3-6x^2-4=0,y^3-3y^2-9y-9=0求x-y 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}/x^2-9y^2的值 已知x²+y²+6x-2y+10=0,求8y分之9x²-y² + 4分之y-3x的值