①已知x:y=-2:3,求[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
①已知x:y=-2:3,求[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2
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-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-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*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知x:y=2:3,求(x^2-y^2/xy)÷[(x+y)×(x-y/x)^3]÷(x/y^2)
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)-y²+(x-y)²-(6x²y-2xy
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值