ГДЗ Математика 6 клас Істер — Вправа 251

Розв'язання

1) $\frac{5}{16} + \frac{11}{12} = \frac{15}{48} + \frac{44}{48} = \frac{59}{48} = 1\frac{11}{48};$

2) $\frac{5}{21} + \frac{5}{28} = \frac{20}{84} + \frac{15}{84} = \frac{35}{84} = \frac{5}{12};$

3) $\frac{15}{19} + \frac{27}{38} = \frac{30}{38} + \frac{27}{38} = \frac{57}{38} = \frac{3}{2} = 1\frac{1}{2};$

4) $\frac{9}{16} + \frac{19}{24} = \frac{27}{48} + \frac{38}{48} = \frac{65}{48} = 1\frac{17}{48};$

5) $\frac{9}{20} - \frac{5}{12} = \frac{27}{60} - \frac{25}{60} = \frac{2}{60} = \frac{1}{30};$

6) $\frac{7}{18} - \frac{1}{45} = \frac{35}{90} - \frac{2}{90} = \frac{33}{90} = \frac{11}{30};$

7) $\frac{11}{42} - \frac{5}{28} = \frac{22}{84} - \frac{15}{84} = \frac{7}{84} = \frac{1}{12};$

8) $\frac{13}{60} - \frac{7}{40} = \frac{26}{120} - \frac{21}{120} = \frac{5}{120} = \frac{1}{24}.$