Odpowiedź:
[tex]6.a)2 \frac{3}{5} + 1 \frac{3}{4} = 2 \frac{12}{20} + 1 \frac{15}{20} = 3 \frac{27}{20} = 4 \frac{7}{20} \\ b)4 \frac{2}{3} - 2 \frac{7}{8} = 4 \frac{16}{24} - 2 \frac{21}{24} = 1 \frac{19}{24} [/tex]
[tex]7. \: 7 \frac{1}{12} - x = 2 \frac{1}{3} \\ - x = 2 \frac{1}{3} - 7 \frac{1}{12} \\ - x = 2 \frac{4}{12} - 7 \frac{1}{12} \\ - x = - 4 \frac{9}{12} \\ x = 4 \frac{3}{4} [/tex]
