1)
[tex]6 - \frac{(2.3 + 5 \div 6.25) \times 7}{8 \times 0.0125 + 6.9} = 6 - \frac{21.7}{7} = \frac{42 - 21.7}{6} = \frac{20.3}{6} [/tex]
2)
[tex] \frac{84}{10} \times \frac{6}{7} \times \frac{20.3}{6} - \frac{20384}{1000} \times \frac{10}{13} = \frac{121.8}{5} - \frac{1568}{100} = 24.36 - 15.68 = 8.68[/tex]
3)
[tex]5 \frac{4}{7} \div \frac{868}{100} = \frac{39}{7} \times \frac{100}{868} = \frac{975}{1519} [/tex]
примерно получается 0,63
