[tex]100\ a)\\\\\frac{1}{2}*0,7=\frac{1}{2}*\frac{7}{10}=\frac{7}{20}\\\\b)\\\\\frac{4}{18}:0,05=\frac{2}{9}:\frac{5}{100}=\frac{2}{9}:\frac{1}{20}=\frac{2}{9}*\frac{20}{1}=\frac{40}{9}=4\frac{4}{9}\\\\c)\\\\0,125*\frac{1}{8}=\frac{125}{1000}*\frac{1}{8}=\frac{1}{8}*\frac{1}{8}=\frac{1}{64}\\\\d)\\\\4\frac{1}{2}+2,75= 4,5+2,75=7,25[/tex]
[tex]e)\\\\ \frac{2}{3}-0,3=\frac{2}{3}-\frac{3}{10}=\frac{20}{30}-\frac{9}{30}=\frac{11}{30}\\\\f)\\\\3\frac{2}{5}+2,15=3\frac{2}{5}+2 \frac{15}{100}= 3\frac{2}{5}+2 \frac{3}{20}= 3\frac{8}{20}+2 \frac{3}{20}=5\frac{11}{20}\\\\g)\\\\3,41-2\frac{3}{4}=3,41-2,75=0,66\\\\h)\\\\0,2:\frac{5}{7}=\frac{2}{10}*\frac{7}{5}=\frac{14}{50}=\frac{7}{25}[/tex]
[tex]101\ a)\\\\ \frac{2}{3}*2,1+2*(3\frac{2}{5}+1,4)=\frac{\not{2}^1}{\not{3}^1}*\frac{\not{21}^7}{\not{10}^5}+2*( \frac{17}{5}+\frac{14}{10})= \frac{7}{5}+2*( \frac{17}{5}+\frac{7}{5})=\\\\=\frac{7}{5}+2*\frac{24}{5}=\frac{7}{5}+\frac{48}{5}=\frac{55}{5}=11\\\\b)\\\\(0,4* \frac{5}{3}- \frac{2}{9}9):0,25=( \frac{ 4}{10}* \frac{5}{3}- \frac{2}{9} ):\frac{25}{100}=( \frac{ 2}{\not{5}^1}* \frac{\not{5}^1}{3}- \frac{2}{9} ):\frac{1}{4}=\\\\=(\frac{2}{3}-\frac{2}{9})*4=(\frac{6}{9}-\frac{2}{9})*4=\frac{4}{9}*4=\frac{16}{9}=1\frac{7}{9}[/tex]
[tex]c)\\\\ (1,2+ \frac{1}{25}):0,4 -(1,75- \frac{5}{4})* \frac{2}{3}=(\frac{12}{10}+ \frac{1}{25}): \frac{4}{10} -(\frac{175}{100}- \frac{5}{4})* \frac{2}{3}=\\\\=(\frac{6}{5}+ \frac{1}{25}): \frac{2}{5} -(\frac{7}{4}- \frac{5}{4})* \frac{2}{3}= (\frac{30}{25}+ \frac{1}{25})* \frac{5}{2} - \frac{2}{4} * \frac{2}{3}=\frac{31}{\not{25}^5}*\frac{\not{5}^1 }{2}-\frac{4}{12}= \\\\=\frac{31}{10}-\frac{1}{3}= \frac{93}{30}-\frac{10}{30}=\frac{83}{30}=2\frac{23}{30}\\\\d)\\\\ \frac{1}{8}:0,3-(1,75- \frac{1}{12})* 0,25=\frac{1}{8}: \frac{3}{10}-(\frac{1 75}{100}- \frac{1}{12})* \frac{25}{100}=\\\\=\frac{1}{\not{8}^4}* \frac{\not{10}^5}{3}-(\frac{7}{4}- \frac{1}{12})* \frac{1}{4}=\frac{5}{12}-(\frac{21}{12}- \frac{1}{12})* \frac{1}{4}=\frac{5}{12}-\frac{\not{20}^5}{12}*\frac{1}{\not{4}^1}=\frac{5}{12}-\frac{5}{12}=0[/tex]
