Resposta :
A= -x+1/1-x e B= -1-x/x-1
A= -x+1/1-x = (1-x)/(1-x) = 1
Então ficará:
A/B = 1 : (-1-x)/(x-1) = 1 * (x-1)/-1-x = (x-1)/-1-x
A= -x+1/1-x = (1-x)/(1-x) = 1
Então ficará:
A/B = 1 : (-1-x)/(x-1) = 1 * (x-1)/-1-x = (x-1)/-1-x