1. 7/2 6/3 15/100 -5/2 -22/7 2. 6.8 - (3.7 - x ) = 8.8 6.8 - 3.7 + x = 8.8 х=8.8 - 6.8 +3.7 х=5.7 3. 4 * (- 0.8) * (2x + 4) = 0 - 3.2 * 2х - 3.2 * 4 = 0 -6.4х - 12.8 = 0 -6.4х = 12.8 х=12.8/(-6.4) х = -2