a)
[tex] - 7 \frac{1}{5} - ( - 3 \frac{4}{7} ) = - 7 \frac{7}{35} + 3 \frac{20}{35} = - 6 \frac{42}{35} + 3 \frac{20}{35} = - 4 \frac{22}{35} [/tex]
b)
[tex] - 3 \frac{1}{8} \div ( - 6 \frac{3}{8} ) = - \frac{25}{8} \div ( - \frac{51}{8} ) = - \frac{25}{8} \times ( - \frac{8}{51} ) = \frac{25}{51} [/tex]
c)
[tex] \frac{15 - ( - 2) \times 4}{ - 11 + 4} + \frac{5 - 2}{2 - 3} = \frac{23}{ - 7} + \frac{3}{ - 1} = - 3 \frac{2}{7} + ( - 3) = - 6 \frac{2}{7} [/tex]
d)
[tex] - 2 \frac{1}{7} - ( - 5 \frac{3}{4} ) = - 2 \frac{4}{28} + 5 \frac{21}{28} = 5 \frac{21}{28} - 2 \frac{4}{28} = 3 \frac{17}{28} [/tex]
e)
[tex] \frac{ - 9 + 5 \times ( - 11)}{4} - 1 = \frac{ - 64}{4} - 1 = - 16 - 1 = - 17 \sqrt{?} [/tex]
f)
[tex] \frac{ - 8 + 4}{3} \times \frac{6}{ - 1 + 3} = - \frac{4}{3} \times \frac{6}{2} = - 4[/tex]
