(2)
1) -2,5 - 1 5/6 = -2 1/2 - 1 5/6 = -2 3/6 - 1 5/6 = -3 8/6 = -4 1/3
2) -4 1/3 : 1 4/9 = -13/3 *9/13 = -3
3) 3 5/9 * (-2 1/4) = -32/9 * 9/4 = -8
4) -3 - (-8) = -3 + 8 = 5
ответ : 5
(3)
1) -3,8 + 2 1/3 = -3 4/5 + 2 1/3 = -3 12/15 + 2 5/15 = -1 7/15
2) -1 7/15 * (-1 7/8) = -22/15 * (-15/8) = 11/4
3) 4 1/6 : (-1 2/3) = 25/6 *(-3/5) = -5/2
4) 11/4 +(-5/2) = 11/4 - 10/4 = 1/4
ответ: 1/4