Дроби к наименьшему общему знаменателю: д)1/6, 3/8, 2/9 е)5/12, 4/15, 3/10 в)4/15, 1/6, 3/20, 5/12 г)7/30, 2/45, 9/20, 17/60

Д)  НОЗ(6,8,9) =3*3*2*4= 72

1/6=  (1*12) / (6*12) =12/72
3/8=  (3*9)/(8*9) = 27/72
2/9 =  (2*8)/ (9*8) = 16/72

е) НОЗ (12,15,10) =3*5*2*2= 15*4=60

5/12 = (5*5)/ (12*5) = 25/60
4/15 = (4*4) / (15*4) = 16/60
3/10= (3*6)/ (10*6) = 18/60

в)  НОЗ (6,12,15,20) = 2*2*5 *3=20*3=60
20= 2*10=2*2*5
15=3*5
12= 2*6=2*2*3
6= 2*3

4/15= 16/60
1/6= 10/60
3/20=(3*3)/ (20*3)= 9/60
5/12= (5*5)/(12*5)=  25/60

г) НОЗ (20,30,45,60) =2*2*3*5 *3 = 60*3= 180
60= 6*10 = 2*3*2*5
20= 2*10=2*2*5
30=3*10=3*2*5
45= 15*3= 3*5*3

7/30 = (6*7)/(30*7) = 42/180
2/45 = (2*4) / (45*4) = 8/180
9/20 = ( 9*9)/(20*9) = 81/180
17/60 = (17*3) / (60*3) = 51/180