[tex]a)\\\\10\frac{4}{5}-2* [-1,6+(-19,5):(- 2\frac{1}{2}) ]=10 \frac{44}{5}-2* [-1\frac{ 6}{10}+(-19 \frac{5}{10}):(- \frac{5}{2}) ]=\\\\= 10\frac{ 4}{5}-2* [-1 \frac{3}{5}+(-19 \frac{1}{2}):(- \frac{5}{2}) ]=10\frac{ 4}{5}-2* [-1 \frac{3}{5}+(- \frac{39}{\not{2}^1})*(- \frac{\not{2}^1}{5}) ]= \\\\= 10\frac{ 4}{5}-2* [- \frac{8}{5}+ \frac{39}{5} ]= 10\frac{ 4}{5}-2* \frac{31}{5} = \frac{54}{5} -\frac{62}{5}=-\frac{ 8}{5}=-1\frac{3}{5} \\\\b)\\\\ 23\frac{3}{4} -3*(-2,4+(-14,7):4\frac{1}{5} )=23\frac{3}{4} -3*(-\frac{24}{10}+(-\frac{14 7}{10}): \frac{21}{5} )=\\\\=23\frac{3}{4} -3*(-\frac{24}{10}+(-\frac{\not{147}^7}{\not{10}^2})* \frac{\not{5}^1}{\not{21}^1} )= 23\frac{3}{4} -3*(-\frac{24}{10}+ \frac{7}{2} )= \\\\= 23\frac{3}{4} -3*(-\frac{24}{10}- \frac{35}{10} )= 23\frac{3}{4} -3*(-\frac{59}{10} )=23\frac{3}{4}+\frac{177}{10}=\\\\[/tex]
[tex]= 23\frac{3}{4}+\frac{177}{10}=23\frac{3}{4}+17\frac{7}{10}=23\frac{15}{20}+17\frac{ 14}{20}=40\frac{29}{20}=41\frac{9}{20}[/tex]
[tex]c)\\\\ (-2,4*1,7+4,28):(2,75-3,45)= (-4,08+4,28):(-0,7)=\\\\=0,2:(-0,7)=\frac{2}{10} :(-\frac{7}{10})=\frac{2}{\not{10}^1}*(-\frac{\not{10}^1}{7})=-\frac{2}{7}\\\\d)\\\\\frac{2}{3} *0,125+(-4,5) =\frac{2}{3} *\frac{ 125}{100} -4 \frac{5}{10}=\frac{\not{2}^1}{3} *\frac{ 1 }{\not{8}^4} -4 \frac{1}{2}=\frac{1}{12}-4\frac{6}{12}=-4\frac{5}{12}[/tex]
[tex]e )\\\\ (-\frac{1}{4})^2-(-1,8):(-1\frac{1}{8}) +1,6*1\frac{2}{3}-(-\frac{3}{4^2})=\\\\= \frac{1}{16} -(-\frac{18}{10}):(- \frac{9}{8}) +\frac{16}{\not{10}^2}* \frac{\not{5}^1}{3}+\frac{3}{16} = \\\\=\frac{1}{16} -(-\frac{\not{9}^1}{5})*(- \frac{8}{\not{9}^1}) +\frac{16}{6} +\frac{3}{16} =\\\\= \frac{1}{16} - \frac{8}{5} +\frac{8}{3} +\frac{3}{16} = \\\\\frac{15}{240}- \frac{384}{240}+\frac{640}{240} +\frac{45}{240}= \frac{700}{240}-\frac{384}{240}=\frac{316}{240}=\frac{79}{60}=1\frac{19}{60}[/tex]
[tex]f)\\\\1,08:(-0,4)- 2\frac{5}{6}:1,7- 2\frac{1}{2}*(1,4-1\frac{4}{5})-(- \frac{7}{15}) =\\\\=\frac{108}{100}:(- \frac{4}{10})- \frac{17}{6}:\frac{17}{10}- \frac{5}{2}*(1\frac{ 4}{10}-1\frac{8}{10})+ \frac{7}{15}=\\\\=\frac{27}{\not{25}^5}*(- \frac{\not{5}^1}{2})- \frac{\not{17}^1}{\not{6}^3}*\frac{\not{10}^5}{\not{17}^1}- \frac{\not{5}^1}{\not{2}^1}*(-\frac{\not{4}^2}{\not{10}^2})+ \frac{7}{15}=\\\\= -\frac{27}{10}-\frac{5}{3} +1+\frac{7}{15}= -\frac{81}{30}-\frac{50}{30} + \frac{30}{30}+\frac{14}{30}=-\frac{131}{30}+\frac{44}{30}=-\frac{87}{30}=-\frac{29}{10}=-2,9[/tex]
