13x+11y=1392 9(x+y)=1080

4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 13x+11y=1392 9(x+y)=1080 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+x+x+x+y=40 x+y= 13x=y= {x=y-3 {x+y=11 {2x+y=13 {3x-2y=81.{x=y-3 {x+y=112.{2x+y=13 {3x-2y=8 [(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+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=? 接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11 3(x+y）-2（x-y）=11 4（x+y)+3（x-y）=9 y=x(x 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?