2x-5y+13=0 9x+6y-8=0解下2元一次

y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? {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*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 2X-5Y+13=0 9X+6Y-8=0 求X与Y的值 已知|5x-y-8|+(7y-x+2)=0则4x+6y 求解简单的二元一次方程组x=3y-2和y=2x-y 2x=3y-12和4y=2x+1 3x-13y=-12和x+3y=2 2x-5y+13=0和9x+6y-8=0 已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2 X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=? 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 1.已知二元一次方程3X+4Y=6,当X,Y互为相反数,X=?Y=?当X与Y相等,X=?Y=?2.{Y=3/2X 3{3X-Y=5 4.{5X+Y=32X+8Y=22 5X+3Y-13=0 2X+3Y=-10.55.{X+1=5（Y+2）3（2X-5）-4（3Y+4）=53-5题用代入法解方程组2.{Y=3/2X 2X+8Y=223{3X-Y=55X+3Y-13=0 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 2x-5y+13=0和9x+6y-8=0 （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 谁来帮我做二元一次方程组?{2001x--2002y=2003{2000x--2001y=2001{x=3y--2{y=2x--y{2x=3y--1{4y=2x+1{3x--13y=--12{x+3y=2{2x--5y+13=0{9x+6y--8=0 x^2+y^2-4x-6y+13=0,求(2/3根号9x+y^2根号x/y^3)-x^2根号1/x-5x根号y/x)的值已知x^2+y^2-4x-6y+13=0,求(2/3根号9x+y^2根号x/y^3)-x^2根号1/x-5x根号y/x)的值