Question

1. дроби к общему знаменателю: 2/21 и 4/62, 7/48 и 5/76, 12/15 и 14/20 2. сократить дроби: 32/92, 155/250

Answer 1

1. Приведите дроби к общему знаменателю: 
$\frac{2}{21} = \frac{2*62}{21*62} = \frac{124}{1302} \\ \\ \frac{4}{62} = \frac{4*21}{62*21} = \frac{84}{1302}$

$\frac{7}{48} = \frac{7*19}{48*19} = \frac{133}{912} \\ \\ \frac{5}{76} = \frac{5*12}{76*12} = \frac{60}{912}$

$\frac{12}{15} = \frac{12*4}{15*4} = \frac{48}{60} \\ \\ \frac{14}{20} = \frac{14*3}{20*3} = \frac{42}{60}$

2. Сократить дроби: 
$\frac{32}{92} = \frac{8}{23} \\ \\ \frac{32}{92} = \frac{4*8}{4*23} = \frac{8}{23} \\ \\ \frac{155}{250} = \frac{31}{50} \\ \\ \frac{155}{250} = \frac{5*31}{5*50} = \frac{31}{50}$