Антонов

1. \: \frac{1 + ( - 3)}{1 - ( - 3)} = \frac{1 - 3}{1 + 3} = \frac{ - 2}{4} = \frac{ - 1}{2} = - 0.5 \\ 2. \: \frac{1 + ( - 1)}{1 - ( - 1)} = \frac{1 - 1}{1 + 1} = \frac{0}{2} = 0 \\ 3. \: \frac{1 +0 }{1 - 0} = \frac{1}{1} = 1 \\ 4. \: \frac{1 + 2}{1 - 2} = \frac{3}{ - 1} = - 3 \\ 5. \: \frac{1 + 3}{1 - 3} = \frac{4}{ - 2} = - 2