268. Выполните действия: 3 a) 5 + 2; 8 6) 10 -7; 4 в) 4 + 10; ж) 3+5; H) 4-5; 11 9 3)9-70)8-1 76 12 12 и) 4+2; 12 Ⅱ) 5-30; κ) 8+71;)4-30 4 г) 12-12; д) 4+3; л) 50-1 e) 7-40; 5 11 M) 40-20:

Решение:

a) 5 + 2\(\frac{3}{8}\) = 7\(\frac{3}{8}\)

б) 10\(\frac{3}{4}\) - 7 = 3\(\frac{3}{4}\)

в) 4\(\frac{1}{6}\) + 10 = 14\(\frac{1}{6}\)

г) 12\(\frac{8}{15}\) - 12 = \(\frac{8}{15}\)

д) 4\(\frac{1}{9}\) + 3\(\frac{4}{9}\) = 7\(\frac{5}{9}\)

е) 7\(\frac{5}{7}\) - 4\(\frac{3}{7}\) = 3\(\frac{2}{7}\)

ж) 3\(\frac{8}{11}\) + 5\(\frac{2}{11}\) = 8\(\frac{10}{11}\)

з) 9\(\frac{7}{12}\) - 7\(\frac{6}{12}\) = 2\(\frac{1}{12}\)

и) 4\(\frac{3}{5}\) + 2\(\frac{4}{5}\) = 6\(\frac{7}{5}\) = 7\(\frac{2}{5}\)

к) 8\(\frac{9}{13}\) + 7\(\frac{12}{13}\) = 15\(\frac{21}{13}\) = 16\(\frac{8}{13}\)

л) 5\(\frac{3}{5}\) - 1\(\frac{4}{5}\) = 4\(\frac{8}{5}\) - 1\(\frac{4}{5}\) = 3\(\frac{4}{5}\)

м) 4\(\frac{5}{11}\) - 2\(\frac{8}{11}\) = 3\(\frac{16}{11}\) - 2\(\frac{8}{11}\) = 1\(\frac{8}{11}\)

н) 4 - \(\frac{5}{9}\) = 3\(\frac{9}{9}\) - \(\frac{5}{9}\) = 3\(\frac{4}{9}\)

о) 8 - \(\frac{7}{12}\) = 7\(\frac{12}{12}\) - \(\frac{7}{12}\) = 7\(\frac{5}{12}\)

п) 5 - 3\(\frac{3}{8}\) = 4\(\frac{8}{8}\) - 3\(\frac{3}{8}\) = 1\(\frac{5}{8}\)

р) 4 - 3\(\frac{5}{9}\) = 3\(\frac{9}{9}\) - 3\(\frac{5}{9}\) = \(\frac{4}{9}\)

Ответ: См. решения выше

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