化简:-3{y-(3x^2-3xy)}-{y+2(4x^2-4xy)}

（-3x^y+2xy)-( )=4x^+xy x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 已知x-y=4xy，则2x+3xy-2yx-2xy-y 化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y² 化简:-3{y-(3x^2-3xy)}-{y+2(4x^2-4xy)} 5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简 (2x²y-3xy²)-3(x²y-2xy²)+2（x²y-4xy&# xy=-2,x+y=3,求代数式（4xy+12y)+[7x-(3xy+4y-x)] 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 3x²y+xy²-[2xy²-4x²y+（x²y-2xy²） 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值