a) −26 − 46 = - (26 + 46) = -72
б) −96,2 + (−10,8) = - (96,2 + 10,8) = -107
в) $$-2 \frac{1}{3} – (-3 \frac{3}{8}) = -2 \frac{1}{3} + 3 \frac{3}{8} = - \frac{7}{3} + \frac{27}{8} = - \frac{7 \cdot 8}{3 \cdot 8} + \frac{27 \cdot 3}{8 \cdot 3} = - \frac{56}{24} + \frac{81}{24} = \frac{81 - 56}{24} = \frac{25}{24} = 1 \frac{1}{24}$$
Ответ: a) -72; б) -107; в) 1 1/24