(6-2xy)(2-6xy)=4(3-xy)(1-3xy)如题,(6-2xy)(2-6xy)怎样化到4(3-xy)(1-3xy)?

xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 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 -3(2x^2-xy)+4(x^2+xy-6) 4(x²+xy-6)-3(2x²-xy) -3(2x²-xy)+4(x²+xy-6) 4xy+6xy-3xy=? (-3xy+2xy)-(4xy+xy) ( )*3xy=6x^2y+2xy^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) 1-2/x+y=xy,4y+6x=xy.求xy的解? 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值 已知x+y=4,xy=-2,求代数式3(xy+2y)-(xy-6x)的值 已知x+y=4,xy=-2,求代数式3（xy+2y）-（xy-6x） 4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6 x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值