8.
a)
[tex]6 + (-4)+(-10) = 6-4-10 = -8\\\\-4-(-9)-3 = -4+9-3 = 2\\\\-16+7-28 = -37[/tex]
b)
[tex]4,3-7,4+1,1 = -2\\\\-6,2+1,6-(-2,3) = -6,2+1,6 + 2,3 = -2,3\\\\7,8-5,4-12,1 = -9,7[/tex]
c)
[tex]-1\frac{1}{3}-\frac{2}{9}+\frac{1}{6} = -1\frac{6}{18}-\frac{4}{18}+\frac{3}{18} = -1\frac{10}{18}+\frac{3}{18} = -1\frac{7}{18}\\\\1\frac{1}{8}-2\frac{1}{4}-(-\frac{1}{2}) =1\frac{1}{8}-2\frac{2}{8}+\frac{4}{8} = -1\frac{10}{8}+1\frac{5}{8} =-\frac{5}{8}\\\\2,1+\frac{1}{5}-3 = 2,1 + 0,2 - 3 = 2,3-3 = -0,7[/tex]
