8.
[tex]a)( - 1 \frac{1}{5} ) \times 1 \frac{2}{3} =( - \frac{6}{5} ) \times \frac{5}{3} = - 2 \\ b)( - 10 \frac{2}{3} ) \div 1 \frac{7}{9} = ( - \frac{32}{3} ) \div \frac{16}{9} = ( - \frac{32}{3} ) \times \frac{9}{16} = - 2 \times3 = - 6[/tex]
9.
[tex]a) - 90 \div 5 = - 18 \\ b)( - 3) \times ( - 18) = 54 \\ c) ( - 1) \times 12 = - 12 \\ d)( - 84) \div ( - 28) = 3[/tex]
