a) (3 - 13): (-17 + 7) = (-10) : (-10) = 1
б) (-1,2 - 1,2): (-1 - 2) = (-2,4) : (-3) = \(\frac{-2,4}{-3}\) = 0,8
в) (\(\frac{1}{4}\) - \(\frac{1}{2}\) - \(\frac{3}{4}\)) : (-2\(\frac{17}{18}\) + 3\(\frac{17}{18}\)) = (\(\frac{1}{4}\) - \(\frac{2}{4}\) - \(\frac{3}{4}\)) : (1\(\frac{17}{18}\)) = (\(\frac{1-2-3}{4}\)) : (\(\frac{18+17}{18}\)) = \(-\frac{4}{4}\) : \(\frac{35}{18}\) = -1 : \(\frac{35}{18}\) = -1 * \(\frac{18}{35}\) = - \(\frac{18}{35}\)
Ответы:
a) 1
б) 0,8
в) -\( \frac{18}{35}\)