[tex]\it{a)2.4 - 4.2 - 3.2 \div \frac{4}{5} = 2.4 - 4.2 - 3.2 \div 0.8 = }[/tex]
[tex]\it{2.4 - 4.2 - 4 = - 1.8 - 4 = - 5.8}[/tex]
[tex]\it{b)4.5 + \frac{31}{10} \times 2.6 = 4.5 + 3.1 \times 2.6 = }[/tex]
[tex]\it{4.5 + 6.2 = 10.7}[/tex]
[tex]\it{c) 34.5 + 9.11 - 9.2 \div 6.4 + 3.1(6) = 34.5 + 9.11 - 1.4375 + 3.1(6) = }[/tex]
[tex]\it{ - 1.4375 + \frac{316 - 31}{90} = - \frac{23}{16} + \frac{285}{90} = - \frac{23}{16} + \frac{19}{6} = \frac{83}{48} }[/tex]
