a)
[tex]1 \frac{3}{4} \times ( - 3 \frac{1}{5} ) = \frac{7}{4} \times ( - \frac{16}{5} ) = - \frac{28}{5} = - 5 \frac{3}{5} [/tex]
b)
[tex]( - 7 \frac{4}{5} ) \div ( - 2 \frac{2}{5} ) = ( - \frac{39}{5} ) \div ( - \frac{12}{5}) = ( - \frac{39}{5} ) \times ( - \frac{5}{12} ) = 3 \frac{3}{12} = 3 \frac{1}{4} [/tex]
c)
[tex]( - 1.4) \times ( - 5.06) = ( - \frac{14}{10} ) \times ( - \frac{506}{100} ) = \frac{1771}{250} = 7 \frac{21}{250} [/tex]
d)
[tex] - 0.056 \div 0.8 = - \frac{56}{1000} \div \frac{8}{10} = - \frac{56}{1000} \times \frac{10}{8} = - \frac{7}{100} = - 0.07[/tex]
