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[tex]1) (-6\frac{2}{3})+(-8,75)+(-2\frac{5}{12} ) = -6\frac{2}{3}-8,75-2\frac{5}{12}=-\frac{20}{3} - \frac{35}{4} -\frac{29}{12} =\frac{107}{6} =-17\frac{5}{6} \\ 2) (-3\frac{7}{15} )+(-0,4)+(-6\frac{1}{3} )= -3\frac{7}{15} -0,4-6\frac{1}{3} =-\frac{52}{15} -\frac{2}{3} -\frac{19}{3} =-\frac{51}{5} = -10\frac{1}{5} \\[/tex][tex]3) (-1,5)+(-3\frac{4}{5} )+(-8\frac{3}{20} ) = -1,5-3\frac{4}{5} -8\frac{3}{20} =-\frac{3}{2} -\frac{19}{5} -\frac{163}{20} =-\frac{269}{20} = -13\frac{9}{20} \\ 4) (-2\frac{5}{8} )+(-9,25)+(-\frac{3}{4} )=-2\frac{5}{8} -9,25-\frac{3}{4} =-\frac{21}{8} -\frac{37}{4} -\frac{3}{4} =-\frac{101}{8} =-12\frac{5}{8}[/tex]