Ты просишь найти значение выражений в заданиях 1 и 2.

Задание 1. 1) $\frac{3}{4} \cdot \frac{6}{5} = \frac{3 \cdot 6}{4 \cdot 5} = \frac{18}{20} = \frac{9}{10} = 0,9$ 2) $\frac{21}{5} \cdot \frac{3}{7} = \frac{21 \cdot 3}{5 \cdot 7} = \frac{3 \cdot 3}{5 \cdot 1} = \frac{9}{5} = 1,8$ 3) $\frac{3}{5} \cdot \frac{25}{4} = \frac{3 \cdot 25}{5 \cdot 4} = \frac{3 \cdot 5}{1 \cdot 4} = \frac{15}{4} = 3,75$ 4) $\frac{9}{5} \cdot \frac{2}{3} = \frac{9 \cdot 2}{5 \cdot 3} = \frac{3 \cdot 2}{5 \cdot 1} = \frac{6}{5} = 1,2$ 5) $\frac{5}{3} \cdot \frac{9}{2} = \frac{5 \cdot 9}{3 \cdot 2} = \frac{5 \cdot 3}{1 \cdot 2} = \frac{15}{2} = 7,5$ 6) $\frac{7}{5} \cdot \frac{12}{35} = \frac{7 \cdot 12}{5 \cdot 35} = \frac{1 \cdot 12}{5 \cdot 5} = \frac{12}{25} = 0,48$ 7) $\frac{12}{5} : \frac{15}{2} = \frac{12}{5} \cdot \frac{2}{15} = \frac{12 \cdot 2}{5 \cdot 15} = \frac{4 \cdot 2}{5 \cdot 5} = \frac{8}{25} = 0,32$ 8) $\frac{6}{5} : \frac{4}{11} = \frac{6}{5} \cdot \frac{11}{4} = \frac{6 \cdot 11}{5 \cdot 4} = \frac{3 \cdot 11}{5 \cdot 2} = \frac{33}{10} = 3,3$ 9) $\frac{3}{5} : \frac{4}{35} = \frac{3}{5} \cdot \frac{35}{4} = \frac{3 \cdot 35}{5 \cdot 4} = \frac{3 \cdot 7}{1 \cdot 4} = \frac{21}{4} = 5,25$ 10) $\frac{15}{4} : \frac{3}{7} = \frac{15}{4} \cdot \frac{7}{3} = \frac{15 \cdot 7}{4 \cdot 3} = \frac{5 \cdot 7}{4 \cdot 1} = \frac{35}{4} = 8,75$ 11) $\frac{21}{2} : \frac{3}{5} = \frac{21}{2} \cdot \frac{5}{3} = \frac{21 \cdot 5}{2 \cdot 3} = \frac{7 \cdot 5}{2 \cdot 1} = \frac{35}{2} = 17,5$ 12) $\frac{14}{5} : \frac{7}{2} = \frac{14}{5} \cdot \frac{2}{7} = \frac{14 \cdot 2}{5 \cdot 7} = \frac{2 \cdot 2}{5 \cdot 1} = \frac{4}{5} = 0,8$ 13) $\frac{1}{4} - \frac{3}{25} = \frac{25}{100} - \frac{12}{100} = \frac{13}{100} = 0,13$ 14) $\frac{1}{5} - \frac{27}{50} = \frac{10}{50} - \frac{27}{50} = -\frac{17}{50} = -0,34$ 15) $\frac{1}{2} - \frac{9}{25} = \frac{25}{50} - \frac{18}{50} = \frac{7}{50} = 0,14$ 16) $\frac{1}{5} - \frac{3}{4} = \frac{4}{20} - \frac{15}{20} = -\frac{11}{20} = -0,55$ 17) $\frac{1}{2} - \frac{13}{50} = \frac{25}{50} - \frac{13}{50} = \frac{12}{50} = \frac{6}{25} = 0,24$ 18) $\frac{1}{10} - \frac{23}{20} = \frac{2}{20} - \frac{23}{20} = -\frac{21}{20} = -1,05$ 19) $\frac{14}{25} + \frac{3}{2} = \frac{28}{50} + \frac{75}{50} = \frac{103}{50} = 2,06$ 20) $\frac{9}{4} + \frac{8}{5} = \frac{45}{20} + \frac{32}{20} = \frac{77}{20} = 3,85$ 21) $\frac{11}{5} + \frac{13}{4} = \frac{44}{20} + \frac{65}{20} = \frac{109}{20} = 5,45$ 22) $\frac{1}{10} + \frac{21}{50} = \frac{5}{50} + \frac{21}{50} = \frac{26}{50} = \frac{13}{25} = 0,52$ 23) $\frac{3}{4} + \frac{7}{25} = \frac{75}{100} + \frac{28}{100} = \frac{103}{100} = 1,03$ 24) $\frac{4}{25} + \frac{15}{4} = \frac{16}{100} + \frac{375}{100} = \frac{391}{100} = 3,91$ Задание 2. 1) $9,3 + 7,8 = 17,1$ 4) $5,7 - 7,6 = -1,9$ 7) $5,2 \cdot 3,1 = 16,12$ 10) $\frac{8,2}{4,1} = 2$ 11) $\frac{13,2}{3} = 4,4$ 12) $2,1 \cdot 9,6 = 20,16$