已知3x=4,3y=6,求92x-y+27x-y.
已知3x=4,3y=6,求92x-y+27x-y.
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知3X=4X,5Y=6Z求X+Y:Y+Z
已知x*x+y*y-4x-6y+13=0,求3x+4y的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
已知x,y满足:x平方+y平方-4x+6y+13=0求(3x+y)-3(3x-y)(x+y)-(x-3y)(x+3y)=
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值