1677
1)
(6 1/4 - 4 1/8)*4 - 3 1/3 : 2 1/2 = ?
?= 2 1/8 * 4 - 1 1/3 = 8 1/2 - 1 1/3 = 7 1/6
2)
(2 4/9 + 1 1/6)* 1 4/5 - 3 1/9 : 2 1/3 =
= 3 11/18 * 1 4/5 - 1 1/3 = 6 1/2 - 1 1/3 = 5 1/6
3)
(2 - 1 7/12) : (3/8 - 1/6)* 3 1/4 =
= 5/12 : 5/24 *3 1/4 = 2* 3 1/4 = 6 1/2
4)
(7/10 - 2/5)*(1/4 + 5/6): 6 1/2 =
= 3/10 * 1 1/12 : 6 1/2 = 13/40 : 6 1/2 = 1/20