y=8:x=7,y=11;x=11y=14的关系式

[(y*y*y-y)/(xy+1)*(xy+1)-(x+y)*(x+y)]/[(x+y)*y/(x+1)]其中x=-11,y=1/12,化简再求值. x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-xy=?x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1 y=?x=?x+y-xy=? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x+y/y=11/8,求x-y/x+2y的值. 化简 x / y(x+y) - y / x(x+y) = 例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3 y'/y=1/x 3x+5y=30 7x-8y=11 x是多少 y是多少 x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x+y=5① x=3y+2① 9x-5y=1① 3x-2y=11① x-2y=y+1① 2x-y=7② x+3y=8② 6x-7y=2② 2x+3y=16② 2x-3y=10②3x+2y=y+1①2x-3y=10②D 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 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=? 6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=? y=2x-3 3x+2y=3 5x-2y=3 x+6y=11 二分之x三分之y+=-3 7x=8y-4 3x+2y=1 2x-y+2z=-4 x+2y-z=3[y=2x-3 3x+2y=3] [5x-2y=3 x+6y=11] [二分之x三分之y+=-3 7x=8y-4] [3x+2y=1 2x-y+2z=-4 x+2y-z=3] {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1