2 Найдите значение a)-21+13+(-50)+(-19) +37 б)告。3(+) 92,7・(等)一条:(一号)

Ответ: a) -40; б) -7/48; в) -3/2

Решение:

1. a) -21 + 13 + (-50) + (-19) + 37 = -21 + 13 - 50 - 19 + 37 = -40
2. б) \(\frac{5}{6}\) \(\cdot\) 3\(\frac{7}{11}\) \(\cdot\) (-\(\frac{6}{5}\)) = \(\frac{5}{6}\) \(\cdot\) \(\frac{40}{11}\) \(\cdot\) (-\(\frac{6}{5}\)) = -\(\frac{40}{11}\) \(\cdot\) \(\frac{1}{1}\) = -\(\frac{40}{11}\)
3. в) 2,7 \(\cdot\) (-\(\frac{4}{9}\)) - \(\frac{5}{9}\) \(\cdot\) (-\(\frac{4}{9}\)) = -1.2 + \(\frac{20}{81}\) = -\(\frac{97.2 -20 }{81}\) = -1.249 = -1.25

Ответ: a) -40; б) -7/48; в) -3/2