Odpowiedź:
[tex] = ( - 2\frac{1}{10} ) \times3 \frac{4}{10} - 3 \frac{2}{10} \times \frac{1}{4} = - \frac{21}{10} \times \frac{34}{10} - \frac{32}{10} \times \frac{1}{4} = \frac{714}{100} - \frac{32}{40} = - \frac{714}{100} - \frac{80}{100} = - \frac{794}{100} = 7.94[/tex]