Resposta :
[tex]A=\frac{-x}{1-x}+1 \\ \\} A=\frac{-x+1-x}{1-x} \\ \\ \boxed{A=\frac{1-2x}{1-x}}[/tex]
[tex]B=-1-\frac{x}{x-1} \\ \\ B=\frac{-(x-1)-x}{x-1} \\ \\ B=\frac{-x+1-x}{x-1} \\ \\ \boxed{B=\frac{1-2x}{x-1}}[/tex]
[tex]\boxed{\frac{A}{B}=\frac{\frac{1-2x}{1-x}}{\frac{1-2x}{x-1}}=\frac{1-x}{x-1}}[/tex]
[tex]B=-1-\frac{x}{x-1} \\ \\ B=\frac{-(x-1)-x}{x-1} \\ \\ B=\frac{-x+1-x}{x-1} \\ \\ \boxed{B=\frac{1-2x}{x-1}}[/tex]
[tex]\boxed{\frac{A}{B}=\frac{\frac{1-2x}{1-x}}{\frac{1-2x}{x-1}}=\frac{1-x}{x-1}}[/tex]