В номерах 1 и 2 выполняете примеры под буквами б,г, е, з, к.м,о, р 1. Вычислите: б) 17/18 - 11/12 ; г) 1/8 + 4/9 ; е) 7/16 + 1/6 ; з) 9/11 + 2/5 ; к) 5/6 + 2/9 ; м) 13/16 + 9/32 ; о) 10/21 + 9/14 ; р) 3/28 + 5/14 ;

Выполняю вычисления: 1. б) $$\frac{17}{18} - \frac{11}{12} = \frac{17 \cdot 2}{18 \cdot 2} - \frac{11 \cdot 3}{12 \cdot 3} = \frac{34}{36} - \frac{33}{36} = \frac{34-33}{36} = \frac{1}{36}$$ 2. г) $$\frac{1}{8} + \frac{4}{9} = \frac{1 \cdot 9}{8 \cdot 9} + \frac{4 \cdot 8}{9 \cdot 8} = \frac{9}{72} + \frac{32}{72} = \frac{9+32}{72} = \frac{41}{72}$$ 3. е) $$\frac{7}{16} + \frac{1}{6} = \frac{7 \cdot 3}{16 \cdot 3} + \frac{1 \cdot 8}{6 \cdot 8} = \frac{21}{48} + \frac{8}{48} = \frac{21+8}{48} = \frac{29}{48}$$ 4. з) $$\frac{9}{11} + \frac{2}{5} = \frac{9 \cdot 5}{11 \cdot 5} + \frac{2 \cdot 11}{5 \cdot 11} = \frac{45}{55} + \frac{22}{55} = \frac{45+22}{55} = \frac{67}{55} = 1\frac{12}{55}$$ 5. к) $$\frac{5}{6} + \frac{2}{9} = \frac{5 \cdot 3}{6 \cdot 3} + \frac{2 \cdot 2}{9 \cdot 2} = \frac{15}{18} + \frac{4}{18} = \frac{15+4}{18} = \frac{19}{18} = 1\frac{1}{18}$$ 6. м) $$\frac{13}{16} + \frac{9}{32} = \frac{13 \cdot 2}{16 \cdot 2} + \frac{9}{32} = \frac{26}{32} + \frac{9}{32} = \frac{26+9}{32} = \frac{35}{32} = 1\frac{3}{32}$$ 7. о) $$\frac{10}{21} + \frac{9}{14} = \frac{10 \cdot 2}{21 \cdot 2} + \frac{9 \cdot 3}{14 \cdot 3} = \frac{20}{42} + \frac{27}{42} = \frac{20+27}{42} = \frac{47}{42} = 1\frac{5}{42}$$ 8. р) $$\frac{3}{28} + \frac{5}{14} = \frac{3}{28} + \frac{5 \cdot 2}{14 \cdot 2} = \frac{3}{28} + \frac{10}{28} = \frac{3+10}{28} = \frac{13}{28}$$