287. Приведите дробь к знаменателю 60: a) 2/1 /30 =/ 2/60; 6) 11/20=/ 60; B) 7/10 =/60; г) 4/15=/ 60; д) 5/12=/ 60; e) 5/6=/ 60; ж) 3/4=/ 60; о) 3/2/30=/ 60; ж) 288. Приведите дробь к знаменателю 48: a) 24/1 /2=/ 24/48; 6) 2/3=/ 48; B) 3/4=/ 48; г) 5/6=/ 48; д) 7/8=/ 48; e) 5/12=/ 48; ж) 9/16=/ 48; з) 5/24=/ 48

Задание 287: Приведите дробь к знаменателю 60

a) \[\frac{2}{30} = \frac{2 \times 2}{30 \times 2} = \frac{4}{60}\]

б) \[\frac{11}{20} = \frac{11 \times 3}{20 \times 3} = \frac{33}{60}\]

в) \[\frac{7}{10} = \frac{7 \times 6}{10 \times 6} = \frac{42}{60}\]

г) \[\frac{4}{15} = \frac{4 \times 4}{15 \times 4} = \frac{16}{60}\]

д) \[\frac{5}{12} = \frac{5 \times 5}{12 \times 5} = \frac{25}{60}\]

e) \[\frac{5}{6} = \frac{5 \times 10}{6 \times 10} = \frac{50}{60}\]

ж) \[\frac{3}{4} = \frac{3 \times 15}{4 \times 15} = \frac{45}{60}\]

з) \[\frac{2}{3} = \frac{2 \times 20}{3 \times 20} = \frac{40}{60}\]

Задание 288: Приведите дробь к знаменателю 48

a) \[\frac{1}{2} = \frac{1 \times 24}{2 \times 24} = \frac{24}{48}\]

б) \[\frac{2}{3} = \frac{2 \times 16}{3 \times 16} = \frac{32}{48}\]

в) \[\frac{3}{4} = \frac{3 \times 12}{4 \times 12} = \frac{36}{48}\]

г) \[\frac{5}{6} = \frac{5 \times 8}{6 \times 8} = \frac{40}{48}\]

д) \[\frac{7}{8} = \frac{7 \times 6}{8 \times 6} = \frac{42}{48}\]

e) \[\frac{5}{12} = \frac{5 \times 4}{12 \times 4} = \frac{20}{48}\]

ж) \[\frac{9}{16} = \frac{9 \times 3}{16 \times 3} = \frac{27}{48}\]

з) \[\frac{5}{24} = \frac{5 \times 2}{24 \times 2} = \frac{10}{48}\]