已知|2x-y|=3,求8x^2-8xy+2y^2-8x+4y-6
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值
已知X+Y=6,XY=-4,求(5X-4Y-3XY)-(8X-Y+2XY)的值
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知(x+y):y=8:3,求2x+5y/3x-y和x^2-xy/y^2+3xy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+xy=10,3y+2xy=6.求4x+8xy+9y=?
已知x+4y-2x+8y+5=0,求x^4-y^4/2x+xy-y·2x-y/xy-y÷(x+y/y)的值.
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*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值