已知x+2y=11,x-2y=4,x\(x^2-2xy+y^2)除以(x^2+xy+y^2)\(x^3-y^3)+[(2
已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)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3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知:3x方+xy-2y方=0,求(x+y/x-y + 4xy/y方-x方)除以 x方+2xy-3y方 / x方-9y方
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值