x=2008,y=2006,求〔2x〔x^2y-xy^2〕+xy〔2xy-x^2〕〕÷x^2y的值.
x-y=4,xy=-2,求代数式〔2x+3y-2xy〕-〔x+4y+xy〕-〔3xy+2y-2x〕的值
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
已知x-xy=8,xy-y=-9,求x+y-2xy的值
x+y=3,xy=-2.求(3xy+10y)+〔5x-(2xy+2y-3x)〕
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知x+y=3xy,求2x+2y-xy/x+y+2xy的值、
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知3x=xy+3y,求2x+xy-2y/y-x-xy的值