13/18+4/81+7/18+41/81== решите удобным способом

Question

13/18+4/81+7/18+41/81== решите удобным способом

Answer 1

13/18 + 4/81 + 7/18 + 41/81 =
= (13/18 + 7/18) + (4/81 + 41/81) =
= 20/18 + 45/81 = 
= 10/9 + 5/9 = 
= 15/9 = 5/3 = 1 2/3