若(2x-y-3)是4x^2-4xy+y^2-m的一个因式则m=

若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 分解因式x^2y+x^2y+2xy^2-4xy^3是x^3y+x^2y+2xy^2-4xy^3 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得：x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 若x-y=3,xy=15,整式（3x-4y+5xy)-(2x-3y-5xy)的值是 化简2(x²y+xy)-3(x²y-xy)-4x²y 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. （-3x^y+2xy)-( )=4x^+xy 若x+y=4,x-y=6,求xy(y^2+y)-y^2(xy+2x)-3xy的值. x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之 若x+y=4 x-y=6 求xy(x^2+y)-y^2(xy+2x)-3xy的值求值