若3X-4Y+=0,2X-Y+8=0求xy的值若3X-4Y+1=0,2X-Y+8=0求xy的值

若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若2x-3y=0,求5x+4y/3x-2y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若x^2-4x+y^2-10y+29=0,求x^2y^2+2x^3y^2+x^4y^2的值 若实数x、y满足x平方+y平方-4x-2y+5=0,求根号8y-2x分之（根号x）+y 若实数X,Y满足x²+y²-4x-2y+5=0求√x+y/√8y-2x 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的值 x-2y+3=0 求x^2-(4y+1)x+4y^2+8y 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x 已知x^2+4y^2-4x+8y+8=0,求x+y 若x+y+3=0,求2/3-2x-2y+(-x-y)^2 求x ,y 9x^2+4y^2-12x-8y+8=0 若x^2+y^2-6x+4y+13=0 求x+y 因式分解 若 x^2+4x+y^2-6y+13=0 求y^x