Пошаговое объяснение:
1) 5/12 + 4/15 =25/60+16/60=41/60
2) 7/34 + 5/51 = 21/102 + 10/102 = 31/102
3) 9/180 + 7/120=18/360+21/360=39/360=13/120
1) 3/5 =1/5+2/5
2) 7/9 =5/9+2/9
3) 5/7 =3/7+2/7
4) 3/10=1/10+2/10
Пошаговое объяснение:
1) 5/12 + 4/15 =25/60+16/60=41/60
2) 7/34 + 5/51 = 21/102 + 10/102 = 31/102
3) 9/180 + 7/120=18/360+21/360=39/360=13/120
1) 3/5 =1/5+2/5
2) 7/9 =5/9+2/9
3) 5/7 =3/7+2/7
4) 3/10=1/10+2/10