1.
а) (5 5/12-3 1/24)*24= (65/12-73/24)*24 = (130/24-73/24)*24 = (57/24)*24 = 57
б) 3/7*7/9+3/4*2/9= 1/2
3 * 7 3 * 2 1 1
-------- + ------------ = --- + ---- = 1/3+1/6 = 2/6+1/6 = 3/6 = 1/2
7 * 9 4 * 9 3 6
2
(9-2 2/15*3 1/8) : 14/9 =
(9-32/15*25/8):14/9=
32 * 25
(9 - ------------ ) : 14/9 =
15 * 8
(9-20/3):14/9=
(9-6 2/3) : 14/9=
7 * 14 98
2 1/3: 14/9 = 7/3:14/9= ---------- = -- = 3 17/27
3 * 9 27