б) -6\frac{6}{21} - (-2\frac{9}{7}) = в) 5\frac{2}{13} - 8\frac{1}{26} = г) 5\frac{4}{15} + 8\frac{1}{3} = д) -6\frac{2}{7} - 3\frac{3}{14} = е) 4\frac{10}{11} - (-7\frac{1}{22}) = ж) 4\frac{11}{12} - 7\frac{13}{18} = а) -2\frac{1}{4} \cdot (-3\frac{1}{3}) = б) 3\frac{1}{9} \cdot (-1\frac{2}{7}) =

Question

Вопрос:

б) -6\frac{6}{21} - (-2\frac{9}{7}) = в) 5\frac{2}{13} - 8\frac{1}{26} = г) 5\frac{4}{15} + 8\frac{1}{3} = д) -6\frac{2}{7} - 3\frac{3}{14} = е) 4\frac{10}{11} - (-7\frac{1}{22}) = ж) 4\frac{11}{12} - 7\frac{13}{18} = а) -2\frac{1}{4} \cdot (-3\frac{1}{3}) = б) 3\frac{1}{9} \cdot (-1\frac{2}{7}) =

Ответ:

Accepted Answer

Решения примеров:

б) \[-6\frac{6}{21} - (-2\frac{9}{7}) = -(6\frac{6}{21} - 2\frac{9}{7}) = -(6\frac{6}{21} - 2\frac{27}{21}) = -4\frac{1}{2}\]

в) \[5\frac{2}{13} - 8\frac{1}{26} = 5\frac{4}{26} - 8\frac{1}{26} = -(8\frac{1}{26} - 5\frac{4}{26}) = -(7 + \frac{27}{26} - 5\frac{4}{26}) = -2\frac{23}{26}\]

г) \[5\frac{4}{15} + 8\frac{1}{3} = \]

д) \[-6\frac{2}{7} - 3\frac{3}{14} = \]

е) \[4\frac{10}{11} - (-7\frac{1}{22}) = \]

ж) \[4\frac{11}{12} - 7\frac{13}{18} = \]

а) \[-2\frac{1}{4} \cdot (-3\frac{1}{3}) = + (2\frac{1}{4} \cdot 3\frac{1}{3}) = \frac{9}{4} \cdot \frac{10}{3} = \frac{9 \cdot 10}{4 \cdot 3} = \frac{3 \cdot 5}{2 \cdot 1} = \frac{15}{2} = 7\frac{1}{2}\]

б) \[3\frac{1}{9} \cdot (-1\frac{2}{7}) = \]