Найдите значение выражения 1 )1/5 +1/9+ 1/3. 2)5/9+1/6+3/4. 3)1/3+4/9+5/6

1)приволим к общ.знаменателю
9/45+5/45+15\45=29/45
2)20/36+6/36+27/36=53/36=1 17/36
3) 6/18+8/18+15/18=29/18=1 11/18

1)
1/5 + 1/9 + 1/3 = 18/90 + 10/90 + 30/90 = 58/90 = 29/45,

2)
5/9 + 1/6 + 3/4 = 20/36 + 6/36 + 27/36 = 53/36 = 1 17/36,

3)
1/3 + 5/9 + 5/6 = 6/18 + 10/18 + 15/18 = 31/18 = 1 13/18