Răspuns:
[(4/5 + 1/10) • 2/9 - 1/15] • 15/4 + 1/2 =
(9/10 • 2/9 - 1/15) • 15/4 + 1/2 =
(1/5 - 1/15) • 15/4 + 1/2 =
2/15 • 15/4 + 1/2 =
1/2 + 1/2 =
1
