Помагте пожалоста и дарю 99 балла

Решите задачу:

$1) \ 1 \frac{1}{4}*1 \frac{1}{5}= \frac{5}{4}* \frac{6}{5}= \frac{6}{4}= \frac{3}{2}=1 \frac{1}{2} \\\\ 2) \ 2 \frac{1}{2}*2 \frac{4}{5}= \frac{5}{2}* \frac{14}{5}= \frac{14}{2}= 7 \\ \\ 5) \ 2\frac{1}{7}*2 \frac{2}{15}= \frac{15}{7}*\frac{32}{15}= \frac{32}{7}= 4 \frac{4}{7} \\ \\ 6) \ 2\frac{2}{9}*2 \frac{19}{40}= \frac{20}{9}*\frac{99}{40}= \frac{11}{2}=5 \frac{1}{2} \\ \\ 9) \ 1\frac{4}{7}*2 \frac{6}{11}= \frac{11}{7}* \frac{28}{11}= \frac{28}{7}=4$

$10) \ 1 \frac{1}{5}*2 \frac{11}{12}= \frac{6}{5}* \frac{35}{12}= \frac{7}{2}=3 \frac{1}{2}$