А) 2,1(4) = 2 + 1,4 = 2 + 1 + 4/10 + 4/100 + 4/1000 + ... = 3 + 4/9 = 3(4/9).
Б) 5,7(2) = 5 + 7,2 = 5 + 7 + 2/10 + 2/100 + 2/1000 + ... = 12 + 2/9 = 12(2/9).
А) 2,1(4) = 2 + 1,4 = 2 + 1 + 4/10 + 4/100 + 4/1000 + ... = 3 + 4/9 = 3(4/9).
Б) 5,7(2) = 5 + 7,2 = 5 + 7 + 2/10 + 2/100 + 2/1000 + ... = 12 + 2/9 = 12(2/9).