请问X^2*Y^6=xy^12

请问X^2*Y^6=xy^12 解方程组：xy/x+y=-6(1) 2xy/x+2y=12(2) 1-2/x+y=xy,4y+6x=xy.求xy的解? xy-2x+6y-12 xy+8 ( )*3xy=6x^2y+2xy^2 已知x-xy=20,xy-y=12,则x-y= ,-2xy+x+y= 已知x-xy=20 xy-y=12,则x-y=（ ）,x+y-2xy=（ ）. 已知:x-xy=20,xy-y=12,则x-y=...,-2xy+x+y=... 已知x-xy =21,xy-y=-12,分别求式子x-y与x-2xy +y 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值. 已知(xy)/(x+y)=6求(3x-2xy+3y)/(-x+3xy-y)的值. 2X=3Y=10,请问12XY=? 请问（3x²y-2xy²-4xy）·（-4x²y²）=?-12x⁴y³+8x³y⁴+16x³y³能继续算么? 请问：若2x²-5xy-12y²=0,则x除以y等于多少? 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 12X^2+XY-6Y^2 已知X+y=6,xy=7 求x^2y+xy^2=已知X+y=6,xy=7 x^2y+xy^2