Срочно помогите, пример 1008

1) $3 \frac{1}{3}+2,5= \frac{10}{3}+ \frac{5}{2}= \frac{20+15}{6}= \frac{35}{6}$

2) $\frac{5}{2}- \frac{4}{3}= \frac{15-8}{6}= \frac{7}{6}$

3) $\frac{35}{6}* \frac{6}{7}=5$

4) $\frac{23}{5}- \frac{7}{3}= \frac{69-35}{15}= \frac{34}{15}$

5) $\frac{23}{5} + \frac{7}{3}= \frac{69+35}{15}= \frac{104}{15}$

6) $\frac{34}{15}* \frac{15}{104} = \frac{34}{104}$

7) $5*5,2=26$

8) $\frac{34}{104}*26= \frac{34}{4}$

9) $\frac{1}{7}- \frac{125}{1000}= \frac{1}{7}- \frac{1}{8}= \frac{8-7}{56}= \frac{1}{56}$

10) $\frac{5}{100} *56= \frac{1}{20}*56= \frac{1}{5} *14= \frac{14}{5}$

11) $\frac{14}{5}+ \frac{57}{10} = \frac{28+57}{10}= \frac{85}{10}= \frac{17}{2}$

12) $\frac{34}{4}* \frac{2}{17}= \frac{2}{2}=1$