Răspuns :
0,(3) = 3/9
3/9 + 1/2 × 0,5 = 3/9 + 1/2 × 1/2 = 3/9 + 1/4 = 1/3 + 1/4 = ( 4 + 3 )/12 = 7/12
1,3 × 2,5 - 12,8 : 4 = 3,25 - 3,2 = 0,05
0,(3) = 3/9
3/9 + 1/2 × 0,5 = 3/9 + 1/2 × 1/2 = 3/9 + 1/4 = 1/3 + 1/4 = ( 4 + 3 )/12 = 7/12
1,3 × 2,5 - 12,8 : 4 = 3,25 - 3,2 = 0,05