2x-3y=0,3x=4y-2=0先到先得是 2x-3y=0,3x+4y-2=0

(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 7y(x-3y)-2(3y-x)=0 .x=?,y=? 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系（要求一步一步写出来） （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 如果A={（x,y）|x,y+2>0},B={（x,y）|2x+3y-6>0},C={（x,y）|x-4 .|x-2y-3|+|2x-y+4|=0则x=y= {2x+y=10 {x-y+z=4 {3x-y-z=0 3x+4y-5=0 x^2+y^2=1求x.y 已知3x-4y=0,则x^2-y^2/x^2+y^2 若2x-3y=0,求5x+4y/3x-2y 已知4x-2y=0,求x-y/3x+2y的值 已知(x+y)^(2)+(x+3y-4)^(2)=0,求x,y的平方和