4x^2+2xy-2y^2+4x+7y-3分解因式:4X^2+2XY-2Y^2+4X+7Y-3=4X^2+(2XY+4X)-(2Y^2-7Y+3)=4X^2+(2Y+4)X-(2Y-1)(Y-3)=(2X+2Y-1)(2X-Y+3) 其中=4X^2+(2Y+4)X-(2Y-1)(Y-3)之后该怎么做?

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) 计算:2xy/(x+y)².(x+y)/4y x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 2x(x-y)+4xy(y-x) 因式分解2x(x-y)+4xy(y-x) 因式分解 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) 化简求值x-4y/2x-7xy+3y×x-2xy-3y/2x+3xy-2y÷3x-6y/4x-4xy+y,其中：x=1999,y=-1 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解x^2(x-y)-4xy(x-y)-4y^2(y-x) 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 化简2(x²y+xy)-3(x²y-xy)-4x²y （-3x^y+2xy)-( )=4x^+xy