[tex]a)\\\\2,2 +(-3\frac{1}{2 })=2\frac{2}{10}-3\frac{5}{10}=-1\frac{3}{10}=-1,3\\\\\\-6,3+(-2\frac{2}{5})=-6\frac{3}{10}-2\frac{4}{10}=-8\frac{7}{10}\\\\\\-8\frac{1}{3}-1,1=-8\frac{1}{3}-1\frac{ 1}{10}=-8\frac{10}{30}-1\frac{3}{30}=-9\frac{13}{30}\\\\\\-3\frac{3}{4}-(-5,1)=-3\frac{3}{4}+5\frac{1}{10}=-3\frac{15}{20}+5\frac{2}{20}=-3\frac{15}{20}+4\frac{22}{20}=1\frac{7}{20}[/tex]
[tex]b)\\\\2,25-3\frac{1}{2}=2\frac{25}{100}-3\frac{1}{2}=2\frac{1}{4}-3\frac{2}{4}=-1\frac{1}{4}\\\\\\-5\frac{1}{8}-0,25=-5\frac{1}{8} -\frac{25}{100}=-5\frac{1}{8} -\frac{1}{4}=-5\frac{1}{8} -\frac{2}{8}=-4\frac{9}{8} -\frac{2}{8}=-4\frac{7}{8}\\\\\\-1,34-(-3\frac{2}{25})=-1\frac{34}{100}+3\frac{2}{25}=-1\frac{17}{50}+3\frac{4}{50}=-1\frac{17}{50}+2\frac{54}{50}=1\frac{37}{50}[/tex]
[tex]-6\frac{2}{3}-5,75=-6\frac{2}{3}-5\frac{75}{100}=-6\frac{2}{3}-5\frac{3}{4}=-6\frac{8}{12}-5\frac{9}{12}=-11\frac{17}{12}=-12\frac{5}{12}[/tex]
[tex]c)\\\\ -\frac{1}{5}-0,5+(-\frac{1}{2})=-\frac{2}{10}-\frac{ 5}{10} -\frac{5}{10} =-\frac{12}{10}=-\frac{6}{5}=-1\frac{1}{5}\\\\\\-3,8+(-8\frac{2}{5})-(-6,5)=-3 \frac{8}{10} -8\frac{4}{10}+6\frac{5}{10}=-11\frac{12}{10}+6\frac{5}{10} =-5\frac{7}{10}=-5,7\\\\\\-4,1-2\frac{7}{20}-4,25=-4 \frac{1}{10}-2\frac{7}{20}-4 \frac{25}{100}=-4 \frac{2}{20}-2\frac{7}{20}-4 \frac{ 5}{20}= -10\frac{14}{20}=\\\\=-10\frac{7}{10}=-10,7[/tex]
[tex]-5\frac{1}{3}-(-2\frac{5}{6}-12\frac{2}{3})=-5\frac{2}{6}-(-2\frac{5}{6}-12\frac{4}{6})=-5\frac{2}{6}-( -14\frac{9}{6})=\\\\=-5\frac{2}{6}+14\frac{9}{6} =9\frac{7}{6}=10\frac{1}{6}[/tex]
