172. Найдите сумму: 1) -6 + (-10); 2)-0,84 + (-0,28); 3)-0,68 + (-1,6); 4)-5\frac{7}{9}+(-2\frac{4}{9}); 5)-\frac{2}{9}+(-\frac{1}{12}); 6) -8\frac{2}{15}+(-7\frac{1}{18}).

Ответ: 1) -16; 2) -1,12; 3) -2,28; 4) -8\frac{2}{9}; 5) -\frac{11}{36}; 6) -15\frac{17}{90}

1. 1) \(-6 + (-10) = -6 - 10 = -16\)
2. 2) \(-0,84 + (-0,28) = -0,84 - 0,28 = -1,12\)
3. 3) \(-0,68 + (-1,6) = -0,68 - 1,6 = -2,28\)
4. 4) \(-5\frac{7}{9}+(-2\frac{4}{9}) = -5\frac{7}{9}-2\frac{4}{9} = -8\frac{2}{9}\)
5. 5) \(-\frac{2}{9}+(-\frac{1}{12}) = -\frac{2}{9}-\frac{1}{12} = -\frac{8}{36}-\frac{3}{36} = -\frac{11}{36}\)
6. 6) \(-8\frac{2}{15}+(-7\frac{1}{18}) = -8\frac{2}{15}-7\frac{1}{18} = -8\frac{12}{90}-7\frac{5}{90} = -15\frac{17}{90}\)

Ответ: 1) -16; 2) -1,12; 3) -2,28; 4) -8\frac{2}{9}; 5) -\frac{11}{36}; 6) -15\frac{17}{90}