2x+y=(4x-y-1)/2=(10+6x+2y）/4

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? 2/x-y + 6/x+y = 11/10 分式方程组 4/x-y - 6/x+y =1/10 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 (x-4y)(2x+y)= [(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2 [(y-2x)(-2x-y)+4(x-2y)平方]/3y,其中x=1,y=-3 [(x+y)(x-y)-(x-y)^2-4xy]/2y,其中x=1,y=-1 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 已知2x+y=10,求代数式((x+y)的平方-(x-y)的平方-2y(x-1/2y))/4y的值 [(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3