Найдите значение выражения
а)(3+1 13/15)*(1-1/3) = 3 11/45
1)) 3+1 13/15= 4 13/15
2)) 1-1/3= 3/3- 1/3= 2/3
3)) 4 13/15• 2/3= (4•15+13)/15 • 2/3=
73/15• 2/3= 146/45= 3 11/45
б) 15:(2/5+1/15+4/25)= 23 44/47
1)) 2/5+ 1/15+ 4/25= (2•15)/(5•15)+ (1•5)/(15•5)+ (4•3)/(25•3)= 30/75+ 5/75+ 12/75= 47/75
2)) 15: 47/75= 15/1• 75/47= 1125/47= 23 44/47