2. Вычислите: 1)-27 +14 + (-80) + 21 + (-28); 2)-3,27 + (-4,84) + 6,51 + (-2,64) + 7,65; 11 13 + 3)48+ + 17 4872 48 + 3. Упростите выражение 7 72

1) -27 + 14 + (-80) + 21 + (-28) = -27 + 14 - 80 + 21 - 28 = -13 - 80 + 21 - 28 = -93 + 21 - 28 = -72 - 28 = -100

2) -3,27 + (-4,84) + 6,51 + (-2,64) + 7,65 = -3,27 - 4,84 + 6,51 - 2,64 + 7,65 = -8,11 + 6,51 - 2,64 + 7,65 = -1,6 + (-2,64) + 7,65 = -4,24 + 7,65 = 3,41

3) \( \frac{11}{48} + \frac{13}{72} + (-\frac{17}{48}) + (-\frac{7}{72}) = \frac{11}{48} - \frac{17}{48} + \frac{13}{72} - \frac{7}{72} = \frac{11 - 17}{48} + \frac{13 - 7}{72} = \frac{-6}{48} + \frac{6}{72} = \frac{-1}{8} + \frac{1}{12} = \frac{-3}{24} + \frac{2}{24} = \frac{-1}{24} \)