Выполните действия:
1) $7\frac{7}{9} - 4\frac{1}{12} + 2\frac{3}{4}$;
2) $17\frac{2}{3} - 6\frac{1}{36} + 4\frac{3}{8}$;
3) $10\frac{9}{16} - (3\frac{11}{12} + 4\frac{4}{9})$;
4) $(20 - 7\frac{23}{36}) - (14\frac{4}{27} - 6\frac{1}{18})$.
$7\frac{7}{9} - 4\frac{1}{12} + 2\frac{3}{4} = 7\frac{28}{36} - 4\frac{3}{36} + 2\frac{27}{36} = 5\frac{52}{36} = 6\frac{16}{36} = 6\frac{4}{9}$
$17\frac{2}{3} - 6\frac{1}{36} + 4\frac{3}{8} = 17\frac{48}{72} - 6\frac{2}{72} + 4\frac{27}{72} = 15\frac{73}{72} = 16\frac{1}{72}$
$10\frac{9}{16} - (3\frac{11}{12} + 4\frac{4}{9}) = 10\frac{9}{16} - (3\frac{33}{36} + 4\frac{16}{36}) = 10\frac{9}{16} - 7\frac{49}{36} = 10\frac{9}{16} - 8\frac{13}{36} = 10\frac{81}{144} - 8\frac{52}{144} = 2\frac{29}{144}$
$(20 - 7\frac{23}{36}) - (14\frac{4}{27} - 6\frac{1}{18}) = (19\frac{36}{36} - 7\frac{23}{36}) - (14\frac{8}{54} - 6\frac{3}{54}) = 12\frac{13}{36} - 8\frac{5}{54} = 12\frac{39}{108} - 8\frac{10}{108} = 4\frac{29}{108}$
Пожаулйста, оцените решение
