3xy(3xy-( ))=9x^2y^2-9xy

3xy(3xy-( ))=9x^2y^2-9xy 2x²y-3(2xy-xy)-xy （-3x^y+2xy)-( )=4x^+xy 当x-y=2xy时,求4x-3xy-4y/xy 由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? (9x^2y-6xy^2)/3xy ( )-(x^2+3xy)=-xy-1/3y^2 ( )*3xy=6x^2y+2xy^2 2xy+5y^2+( )=x^2+3xy 3X^2+XY+Y=15 求XY. 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知：x²-xy=9,xy-y²=5,则x²-2xy+y²=（）,3x²+xy-2y²+（） 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? xy^2=-3,求-xy(x^2y^5-xy^3-y) 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 已知xy^2=-2xy(x^2y^5-xy^3-y) x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?