9, (4) = 9.4444... = 9 + 0.4 + 0.04 + 0.004 + ...= 9 + 4/10 + 4/100 + 4/1000 + ...= 9 + 4/(10-1)= 9 + 4/9= (9*9 + 4)/9= 85/9
1, (2) = 1.2222... = 1 + 0.2 + 0.02 + 0.002 + ...= 1 + 2/10 + 2/100 + 2/1000 + ...= 1 + 2/(10-1)= 1 + 2/9= (1*9 + 2)/9= 11/9
Итак, 9,(4) = 85/9 и 1,(2) = 11/9.
9, (4) = 9.4444... = 9 + 0.4 + 0.04 + 0.004 + ...
= 9 + 4/10 + 4/100 + 4/1000 + ...
= 9 + 4/(10-1)
= 9 + 4/9
= (9*9 + 4)/9
= 85/9
1, (2) = 1.2222... = 1 + 0.2 + 0.02 + 0.002 + ...
= 1 + 2/10 + 2/100 + 2/1000 + ...
= 1 + 2/(10-1)
= 1 + 2/9
= (1*9 + 2)/9
= 11/9
Итак, 9,(4) = 85/9 и 1,(2) = 11/9.