Рис. 6.6 6.59 Найдите разность: a) 7 3/5 - 1 2/5; б) 28 6/13 - 7 1/13 г) 23 + 9/10; в) 6 - 2/5; г) 21 - 5/9 e) 15 8/11 + 4 3/11; д) 4 1/7 - 1 4/7 e) 12 2/5 - 1 4/5 ж) 4 1/2 + 3 1/4 з) 5 1/7 - 3 20/21

6.59

• a) \(7\frac{3}{5} - 1\frac{2}{5} = \frac{38}{5} - \frac{7}{5} = \frac{31}{5} = 6\frac{1}{5}\)
• б) \(28\frac{6}{13} - 7\frac{1}{13} = \frac{370}{13} - \frac{92}{13} = \frac{278}{13} = 21\frac{5}{13}\)
• в) \(6 - \frac{2}{5} = \frac{30}{5} - \frac{2}{5} = \frac{28}{5} = 5\frac{3}{5}\)
• г) \(21 - \frac{5}{9} = \frac{189}{9} - \frac{5}{9} = \frac{184}{9} = 20\frac{4}{9}\)
• д) \(4\frac{1}{7} - 1\frac{4}{7} = \frac{29}{7} - \frac{11}{7} = \frac{18}{7} = 2\frac{4}{7}\)
• e) \(12\frac{2}{5} - 1\frac{4}{5} = \frac{62}{5} - \frac{9}{5} = \frac{53}{5} = 10\frac{3}{5}\)
• ж) \(4\frac{1}{2} + 3\frac{1}{4} = \frac{9}{2} + \frac{13}{4} = \frac{18}{4} + \frac{13}{4} = \frac{31}{4} = 7\frac{3}{4}\)
• з) \(5\frac{1}{7} - 3\frac{20}{21} = \frac{36}{7} - \frac{83}{21} = \frac{108}{21} - \frac{83}{21} = \frac{25}{21} = 1\frac{4}{21}\)
• г) \(23 + \frac{9}{10} = \frac{230}{10} + \frac{9}{10} = \frac{239}{10} = 23\frac{9}{10}\)
• e) \(15\frac{8}{11} + 4\frac{3}{11} = \frac{173}{11} + \frac{47}{11} = \frac{220}{11} = 20\)

Ответ: смотри решение выше

Ответ: смотри решение выше