Найдите значение выражения:
а)

1 \frac{7}{9} + 28 + 2 \frac{5}{12} + 5 \frac{2}{9} + \frac{7}{12} + 4 \frac{3}{4}

;
б)

5 \frac{3}{5} - 3, 15 + 7 \frac{12}{25}

;
в)

8 \frac{5}{9} - (4 \frac{2}{9} + 2 \frac{1}{6})

;
г)

(18 \frac{7}{12} + 3 \frac{1}{5}) - 7 \frac{5}{12}

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Математика 6 класс Виленкин. Номер №400

1 \frac{7}{9} + 28 + 2 \frac{5}{12} + 5 \frac{2}{9} + \frac{7}{12} + 4 \frac{3}{4} = 1 \frac{7}{9} + 5 \frac{2}{9} + 28 + 2 \frac{5}{12} + \frac{7}{12} + 4 \frac{9}{12} = 6 \frac{9}{9} + 28 + 6 \frac{21}{12} = 7 + 28 + 6 \frac{9}{12} = 42 \frac{3}{4}

5 \frac{3}{5} - 3, 15 + 7 \frac{12}{25} = 5 \frac{15}{25} + 7 \frac{12}{25} - 3 \frac{15}{100} = 12 \frac{27}{25} - 3 \frac{15}{100} = 12 \frac{108}{100} - 3 \frac{15}{100} = 9 \frac{93}{100} = 9, 93

8 \frac{5}{9} - (4 \frac{2}{9} + 2 \frac{1}{6}) = 8 \frac{5}{9} - (4 \frac{4}{18} + 2 \frac{3}{18}) = 8 \frac{5}{9} - 6 \frac{7}{18} = 8 \frac{10}{18} - 6 \frac{7}{18} = 2 \frac{3}{18} = 2 \frac{1}{6}

(18 \frac{7}{12} + 3 \frac{1}{5}) - 7 \frac{5}{12} = (18 \frac{35}{60} + 3 \frac{12}{60}) - 7 \frac{5}{12} = 21 \frac{47}{60} - 7 \frac{5}{12} = 21 \frac{47}{60} - 7 \frac{25}{60} = 14 \frac{22}{60} = 14 \frac{11}{30}

ГДЗ Математика 6 класс Виленкин, Жохов, Чесноков