若3^x=4,3^y=6,求9^2x-y+27^x-y

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 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若3^x=4,3^y=6,求9^2x-y+27^x-y的值. 若3^x=4,3^y=6,求9^2x-y+27^x-y 若3^x=4,3^y=6,求9^2x-y+27^x-y 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=3:2,求代数式4X-9Y:2X+3Y 已知x/y=3/2求代数式4x-9y/2x+3y 若2x-3y=0,求5x+4y/3x-2y 若／X+Y-9／+（2X-Y+3)=0求X与Y的值 已知x-2y=2,求4x-y-8分之3x+y-6 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 若x*x-4y*y=-15,x+2y=3,求x和y的值 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 已知实数x y满足x^3-6x^2-4=0,y^3-3y^2-9y-9=0求x-y