4 - (2/3 + 2 ) + (2 - 2/3)
- 2/3 -2 +2 - 2/3 = -4/3 = - 1ц.1/3
4 - (2/3 + 2 ) + (2 - 2/3) = 4 - 2/3 - 2 + 2 - 2/3 = 4 - 2_2/3 = 2 - 2/3 = 1_1/3