18x+6y=24 x=y

18x+6y=24 x=y x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= y=-6/x (x 1.多项式a(x-y)+b(-y+x)-c(x-y)²各项的公因式是（_________)2.a(x-y)²-3(y-x)=(x-y)(_______)3.6(x-y)³+18(y-x)²=6(x-y)²(________)4.先分解因式后求值：18x²(x-2y)²-24xy(2y-x)²-6x(2y-x)³.其中x= x+y=45,24x+18y=960 XY=6,X+Y=18,X/Y=? 解方程组（三分之x+y）+y=6,3(x+y)-y=24 解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3 x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? (计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18 解方程 x(x+y+z)=6 y(x+y+z)=12 z(x+y+z)=18 解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18 二元一次方程 x+y/2+x-y/3=6 2(x+y)-3x+3y=24