3^x=4 3^y=6求9^2x+y+27^x+y的值

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 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=3:2,求代数式4X-9Y:2X+3Y 已知x/y=3/2求代数式4x-9y/2x+3y 已知x-2y=2,求4x-y-8分之3x+y-6 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 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 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷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 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！ 已知x^2+y^2+6x-2y+10=0求8y/9x^2-y^2+4/y-3x 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知x²+y²+6x-2y+10=0,求8y分之9x²-y² + 4分之y-3x的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y) 已知(x+2y)(2x-3y)=y(y-4x),试求x/y的值