Перемножьте дроби. 1) 6/25*20/21 2) 17/30*26/51 3) 57/16*48/85 4) 77/81*36/55 5)...

Решите задачу:

$\frac{6}{25} * \frac{20}{21} = \frac{6}{5} * \frac{4}{21}= \frac{3*4}{5*7} = \frac{12}{35}$
$\frac{17}{30}* \frac{26}{51} = \frac{1}{30} * \frac{26}{3}= \frac{1*13}{10*3}= \frac{13}{30}$
$\frac{57}{16} * \frac{48}{85}= \frac{57*3}{1*85} = \frac{171}{85}=2\frac{1}{85}$
$\frac{77}{81}* \frac{36}{55}= \frac{7*4}{9*5}= \frac{28}{45}$
$\frac{25}{63} * \frac{21}{35}= \frac{5*3}{9*7} = \frac{15}{63}$
$\frac{91}{96} * \frac{64}{65} = \frac{91*16}{24*65}= \frac{91*2}{3*65}= \frac{182}{135}= 1 \frac{47}{135}$