[tex]-7,5-9,2 = -16,7\\9,74-4,6 = 5,14\\5 - \frac38 = \frac{40}{8} -\frac38=\frac{37}8=4\frac58=4,625\\-0,3*-0,3=0,3*0,3=\frac{3}{10}*\frac{3}{10}=\frac{9}{100}=0,09 \\2 \frac23* 2 \frac23= \frac{8}{3} *\frac{8}{3}=\frac{64}{9}=7\frac19\\15 * 3 \frac15=\frac{15}{1}*\frac{16}{5}=\frac{240}{5}=48\\-0,789*100= -78,9\\[/tex]
[tex]\frac{5- \frac37}{\frac3{14}}= \frac{\frac{32}{7} }{\frac{3}{14} }=\frac{32}{7}*\frac{14}{3}=\frac{64}{3}=21\frac13 \\\frac{7,5+ 2}{5} =\frac{9,5}{5}=\frac{95}{10}*\frac{1}{5}=\frac{95}{50} = \frac{190}{100} =1,9 \\6-\frac1{12}* \frac23=6-\frac{1}{18}=5\frac{17}{18} \\\frac{-6\frac13}{2} =\frac{-\frac{19}{3} }{2}=-\frac{19}{3}*\frac12=-\frac{19}{6}= -3\frac16 \\-3*-3 * \frac13=-3*-1=3\\56,8 - 7,451=49,349\\\frac{364}{ 0,14} = \frac{36400}{14}=2600 \\[/tex]
[tex]1,24 * 3,12=\frac{124}{100}* \frac{312}{100}=\frac{38688}{10000}=3,8688\\-3,22 * 0,7= -\frac{322}{100}*\frac{7}{10}=-\frac{2254}{1000}=-2,254\\[/tex]