Răspuns:
Explicație pas cu pas:
0,4 = 4/10 = 2/5
2/3 : (2/5 + 2/5 : 3) = 2/3 : (2/5 + 2/15) = 2/3 : (6/15 + 2/15) = 2/3 : 8/15 =
2/3 * 15/8 = 30/24 = 5/4
2/3 : (0,4 + 0,4 : 3) =
= 2/3 : ( 2/5 + 2/5 × 1/3)
= 2/3 : (2/5 + 2/15)
= 2/3 : 8/15
= 2/3 × 15/8
= 5/4
