x+y=2,xy=8,(2x+y)×(x+y)=多少?
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
2(xy^2+3y^3-x^2y)-(-2x^2y+y^3+xy^2)-4y^3等于多少x=2,y=3
1/x-1/y=3 求x-3xy-y/2x-xy-2y 等于多少
如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
若x-y=5.xy=6,x^2y+xy^2等于多少
x^=2-xy y^=1-xy 则x^-y^ 多少啊
2x+8y-xy=0(x>0,y>0),求x+y的最小值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
x^2+xy+x=36,y^2+xy+y=20,求x+y.