- 3 (1,2x - 2) - (4 - 4,6х) + 6(0,2x -1) =
= - 3 * 1,2х - 3 * (-2) - 4 + 4,6х + 6 *0,2х + 6*(-1) =
= - 3,6х + 6 - 4 + 4,6х + 1,2х - 6 =
= (-3,6х +4,6х +1,2х) + (6-4-6) =
= 2,2х -4
при х= -15/22
2,2 * (-15/22) - 4 = 22/10 * (-15/22) - 4 = -1,5 - 4 = - 5,5
1. 2ba-2b^2
2. -4c+4,5d
3. -1/3x+4/9y
4. 7m^2-7mn-7mp
5. 1,5ca+0,9c^2_0,6cd
6. -1 1/2x-2 1/2y-1 1/4
1) 7/15 и 5/9 = 21/45 и 25/45
2) 1/6 и 3/10 = 5/30 и 9/30