a) -3,52*1,7; б) (-2,88): (-0,9); в) 42 3/7 - 53 2/3; г) (6,4-6 2/5)/8; д) (17 1/3 - 17 5/6)/7; e) (1-2 1/3)/(1+2 1/3).

Решим примеры:

а) $$-3,52 \cdot 1,7 = -5,984$$

б) $$(-2,88) : (-0,9) = 3,2$$

в) $$42\frac{3}{7} - 53\frac{2}{3} = \frac{297}{7} - \frac{161}{3} = \frac{297 \cdot 3 - 161 \cdot 7}{21} = \frac{891 - 1127}{21} = \frac{-236}{21} = -11\frac{5}{21}$$

г) $$\frac{6,4 - 6\frac{2}{5}}{8} = \frac{6,4 - 6,4}{8} = \frac{0}{8} = 0$$

д) $$\frac{17\frac{1}{3} - 17\frac{5}{6}}{7} = \frac{\frac{52}{3} - \frac{107}{6}}{7} = \frac{\frac{104 - 107}{6}}{7} = \frac{\frac{-3}{6}}{7} = \frac{-\frac{1}{2}}{7} = -\frac{1}{2 \cdot 7} = -\frac{1}{14}$$

е) $$\frac{1-2\frac{1}{3}}{1+2\frac{1}{3}} = \frac{1-\frac{7}{3}}{1+\frac{7}{3}} = \frac{\frac{3-7}{3}}{\frac{3+7}{3}} = \frac{\frac{-4}{3}}{\frac{10}{3}} = \frac{-4}{10} = -0,4$$