2. Вычислите: 1) 37 + (-50) + 22 +13 + (-28); 2)-1,32 + 2,41+ 3,77+(-4,68) + 0,59; 3) \(\frac{16}{25}\) + \(\frac{4}{21}\) + \(\frac{13}{25}\) + \(\frac{21}{27}\)

1) Вычислим:

• 37 + (-50) + 22 + 13 + (-28) = 37 - 50 + 22 + 13 - 28 = (37 + 22 + 13) + (-50 - 28) = 72 - 78 = -6

2) Вычислим:

• -1,32 + 2,41 + 3,77 + (-4,68) + 0,59 = (-1,32 - 4,68) + (2,41 + 3,77 + 0,59) = -6 + 6,77 = 0,77

3) Вычислим:

• \(\frac{16}{25}\) + \(\frac{4}{21}\) + \(\frac{13}{25}\) + \(\frac{21}{27}\) = (\(\frac{16}{25}\) + \(\frac{13}{25}\)) + (\(\frac{4}{21}\) + \(\frac{21}{27}\)) = \(\frac{29}{25}\) + \(\frac{4}{21}\) = \(\frac{29 \cdot 21 + 4 \cdot 25}{25 \cdot 21}\) = \(\frac{609 + 100}{525}\) = \(\frac{709}{525}\) = \(1 \frac{184}{525}\) = \(\frac{16}{21}\)