zad.2
a)
[tex]2.4 \div 1 \frac{1}{5} + \frac{4}{5} = 2.4 \div 1.2 + 0.8 = 2 + 0.8 = 2.8[/tex]
b)
[tex]7.2 \div 1 \frac{4}{5} + 3 \frac{1}{4} \times 0.4 = 7.2 \div 1.8 + 3.25 \times 0.4 = 4 + 1.3 = 5.3 [/tex]
c)
[tex]5.4 \div 0.9 \times 3.7 \times \frac{1}{2} = 5.4 \div 0.9 \times 3.7 \times 0.5 = 11.1[/tex]
d)
[tex]4.2 \div \frac{3}{5} \times 3 \frac{1}{4} \div 0.4 = 4.2 \div 0.6 \times 3.25 \div 0.4 = 56.875[/tex]
zad.3
a)
[tex] \frac{3}{7} - 0.2 = \frac{3}{7} - \frac{2}{10} = \frac{30 - 14}{70} = \frac{16}{70} = \frac{8}{35} [/tex]
b)
[tex]1.9 + \frac{1}{3} = \frac{19}{10} + \frac{1}{3} = \frac{57 + 10}{30} = \frac{67}{30} = 2 \frac{7}{30} [/tex]
c)
[tex]2.4 \times 2 \frac{1}{6} = 2 \frac{4}{10} \times 2 \frac{1}{6} = \frac{24}{10} \times \frac{13}{6 } = \frac{52}{10} = 5 \frac{2}{10} = 5 \frac{1}{5} [/tex]
d)
[tex]3 \frac{2}{3} \div 1.1 = \frac{11}{3} \div 1 \frac{1}{10} = \frac{11}{3} \div \frac{11}{10} = \frac{11}{3} \times \frac{10}{11} = \frac{10}{3} = 3 \frac{1}{3} [/tex]