[tex]a)\\\\ 0,75 : \frac{1}{3} + 1,28 : 0,04 - 2 \frac{1}{4} * (3,5 - 2\frac{1}{3}) + 1,65 =\\\\= \frac{75 }{100}*3+\frac{ 128}{100} : \frac{4}{100} - \frac{9}{4} * (3\frac{5}{10} - 2\frac{1}{3}) + 1\frac{65}{100} = \\\\= \frac{3 }{4}*3+\frac{\not{128}^{32}}{\not{100}^1} * \frac{\not{100}^1}{\not{4}^1} - \frac{9}{4} * (3\frac{15}{30} - 2\frac{10}{30}) + 1\frac{13}{20} = \frac{9}{4} +32-\frac{9}{4}* 1\frac{5}{30}+1\frac{13}{20}=[/tex]
[tex]=2\frac{1}{4}+32-\frac{\not{9}^3}{4}*\frac{35}{\not{30}^{10}}+1\frac{13}{20}= 2\frac{1}{4}+32-\frac{105}{40}+1\frac{13}{20}= 2\frac{10}{40}+32-2\frac{25}{40}+1\frac{26}{40}=33\frac{11}{40}[/tex]
[tex]b)\\\\(2,5 - 1 \frac{2}{3}) : 1\frac{2}{3} - ( \frac{1}{3})^2 + 1,25: 0,05 - 16,8= \\\\=(\frac{25}{10 } -\frac{5}{3}) :\frac{5}{3} -\frac{1}{9} +\frac{125}{100}: \frac{ 5 }{100}- 16\frac{8}{10}=\\\\= (\frac{5}{2} -\frac{5}{3})*\frac{3}{5} -\frac{1}{9} +\frac{ 5}{4}: \frac{1}{20}-16\frac{8}{10}=\\\\= (\frac{15}{6} -\frac{10}{6})*\frac{3}{5} -\frac{1}{9} +\frac{ 5}{\not{4}^1}* \frac{\not{20}^5}{1} -16\frac{8}{10} = \frac{\not{5}^1}{\not{6}^2}*\frac{\not{3}^1}{\not{5}^1}-\frac{1}{9} +25-16\frac{8}{10}=[/tex]
[tex]= \frac{1}{2} -\frac{1}{9}+8\frac{2}{10} = \frac{45}{90} -\frac{10}{90}+8\frac{18}{90} =\frac{35}{90}+ 8\frac{18}{90}=8\frac{53}{90}[/tex]
[tex]c)\\\\1\frac{1}{4}: 0,5 + 0,954: 0,09- 3\frac{1}{2} * (2\frac{7}{8}-1,275) + 2,6 =\\\\= \frac{5}{4}:\frac{ 5}{10} + \frac{954}{1000}:\frac{ 9}{100}- \frac{7}{2} * (2\frac{7}{8}-1 \frac{275}{1000}) + 2,6 =\\\\= \frac{\not{5}^1}{\not{4}^2}*\frac{\not{10}^5}{\not{5}^1} + \frac{\not{954}^{106}}{\not{1000}^{10}}*\frac{\not{100}^1}{ \not{9}^1} - \frac{7}{2} * (2\frac{7}{8}-1 \frac{11}{40}) + 2 \frac{6}{10} =\\\\= \frac{5}{2}+\frac{106}{10} -\frac{7}{2}*(2\frac{35}{40}-1\frac{11}{40})+2\frac{6}{10}=[/tex]
[tex]2\frac{1}{2}+10\frac{ 6}{10} -\frac{7}{2}* 1\frac{24}{40} +2\frac{6}{10}=\\\\= 2\frac{5}{10}+12\frac{ 12}{10} -\frac{7}{2}* \frac{64}{40}= 2\frac{5}{10}+13\frac{ 2 }{10} -\frac{7}{\not{2}^1}* \frac{\not{16}^8 }{10}=15\frac{7}{10}-\frac{56}{10}= \\\\=15\frac{7}{10}-5\frac{6}{10}=10\frac{1}{10}=10,1[/tex]
