Odpowiedź:
4. a)
[tex] \frac{1}{4} - 1 \frac{1}{2} + 2 \frac{2}{3} - 5 = \frac{1}{4} - 1 \frac{2}{4} + 2 \frac{2}{3} - 5 = - 1 \frac{1}{4} + 2 \frac{2}{3} - 5 = - 1 \frac{3}{12} + 2 \frac{8}{12} - 5 = 1 \frac{ 5}{12} - 5 = - 3 \frac{7}{12} [/tex]
b)
[tex] \frac{1}{2} \div ( - 1 \frac{2}{3} ) \times 2 \frac{1}{4} \div ( - 3 \frac{3}{5} ) \times ( - 5 \frac{1}{3} ) = \frac{1}{2} \times ( - \frac{3}{5} ) \times 2 \frac{1}{4} \div ( - 3 \frac{3}{5} ) \times ( - 5 \frac{1}{3} ) = - \frac{3}{10} \times \frac{9}{4} \div ( - 3 \frac{3}{5} ) \times ( - 5 \frac{1}{3} ) = - \frac{27}{40} \times ( - \frac{5}{18} ) \times ( - 5 \frac{1}{3} ) = \frac{3}{16} \times ( - \frac{16}{3} ) = - 1[/tex]
