Выполните указанные действия: №514 1)ax-y/a+b+y+bx/a+b 2)n+mx/m+3-n-3x/m+3 №515 1)a/x-1+b/1-x 2)2x/a-b-x/b-a

1) (a x-y)/(a+b)+(y+bx)/(a+b) = (ax-y+y+bx)/(a+b) = (ax+bx)/(a+b) = x(a+b)/(a+b) = x

2) (n+mx)/(m+3)-(n-3x)/(m+3) = (n+mx-n+3x)/(m+3) = (mx+3x)/(m+3) = x(m+3)/(m+3) = x

1) a/(x-1)+b/(1-x) = (a-b)/(x-1)

2) 2x/(a-b)-x/(b-a) = (2x+x)/(a-b) = 3x/(a-b)