[tex]10.1a)\\\\ \frac{1}{2}+0,4=\frac{1}{2}+\frac{4}{10}=\frac{5}{10}+\frac{4}{10}=\frac{9}{10}\\\\1,2+ \frac{3}{4}=1\frac{2}{10}+\frac{3}{4}=1\frac{4}{20}+\frac{15}{20}=1\frac{19}{20}\\\\7,1-2\frac{1}{5} =7\frac{1}{10}-2\frac{2}{10}=6\frac{11}{10}-2\frac{2}{10}=4\frac{9}{10}[/tex]
[tex]b)\\\\ \frac{1}{3}+1,4=\frac{1}{3}+1 \frac{4}{10}=\frac{10}{30}+1 \frac{12}{30}=1\frac{22}{30}=1\frac{11}{15}\\\\3,25+\frac{2}{3}=3\frac{25}{100}+\frac{2}{3}=3\frac{1}{4}+\frac{2}{3}=3\frac{3}{12}+\frac{8}{12}=3\frac{11}{12}\\\\6\frac{1}{6}-2,2=6\frac{1}{6}-2\frac{ 2}{10}=6\frac{5}{30}-2\frac{ 6}{30}=5\frac{35}{30}-2\frac{ 6}{30}=3\frac{29}{30}\\\\[/tex]
[tex]c)\\\\ 0,8*\frac{1}{2}=\frac{8}{10}*\frac{1}{2}=\frac{\not{4}^2}{5}*\frac{1}{\not{2}^1}=\frac{2}{5}\\\\\frac{3}{4}*4,8=\frac{3}{4}*\frac{48}{10}=\frac{3}{\not{4}^1}*\frac{\not{24}^6}{5}= \frac{18}{5}=3\frac{3}{5}\\\\3,6*\frac{5}{6}=\frac{36}{10}*\frac{5}{6}=\frac{\not{18}^3}{\not{5}^1}*\frac{\not{5}^1}{\not{6}^1}=3[/tex]
[tex]d)\\\\ 5,25:2\frac{1}{2}=\frac{525}{100}:\frac{5}{2}=\frac{21}{\not{4}^2}*\frac{\not{2}^1}{5} =\frac{21}{10}=2\frac{1}{10}\\\\6\frac{2}{7}:1,1= \frac{44}{7}: \frac{11}{10}= \frac{\not{44}^4}{7}*\frac{10}{\not{11}^1}= \frac{40}{ 7}=5\frac{5}{7}\\\\4,42:3\frac{2}{5}=\frac{442}{100}:\frac{17}{5}=\frac{\not{221}^{13}}{\not{50}^{10}}*\frac{\not{5}^1}{\not{17}^1}=\frac{13}{10}=1\frac{3}{10}[/tex]
