Question

Doar b,c,d

OFER COROANA+MULTE PCT

Answer 1

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Answer 2

$a) \\ \\ ( - \frac{9}{10}) + ( - \frac{5}{12}) + ( + \frac{2}{15}) + ( - \frac{7}{30}) = - \frac{9}{10} - \frac{5}{12} + \frac{2}{15} - \frac{7}{30} = \frac{ - 54 - 25 + 8 - 14}{60} = \frac{ - 85}{60} = - \frac{85}{60} = - \frac{17}{12}$

$b) \\ \\ ( + \frac{3}{4}) + ( - \frac{5}{24}) + ( + \frac{7}{8}) + ( - \frac{1}{16}) = \frac{3}{4} - \frac{5}{24} + \frac{7}{8} - \frac{1}{16} = \frac{36 - 10 + 42 - 3}{48} = \frac{65}{48} = 1 \frac{17}{48}$

$c) \\ \\ ( - \frac{7}{36}) + ( - \frac{5}{18}) + ( - \frac{1}{24}) + ( + \frac{11}{48}) = - \frac{7}{36} - \frac{5}{18} - \frac{1}{24} + \frac{11}{48} = \frac{ - 28 - 40 - 6 + 33}{144} = \frac{ - 41}{144} = - \frac{41}{144}$

$d) \\ \\ ( - \frac{5}{48}) + ( + \frac{7}{18}) + ( - \frac{1}{36}) + ( - \frac{11}{12}) = - \frac{5}{48} + \frac{7}{18} - \frac{1}{36} - \frac{11}{12} = \frac{ - 15 + 56 - 4 - 132}{144} = \frac{ - 95}{144} = - \frac{95}{144}$