0.4(5d-4) - 0.2(17+13d)+0.6 = -5 ;
2d - 1.6 - 3.4 - 2.6d + 0.6 = -5 ;
2d - 5 - 2d = -5 ;
-5 = -5 ;
Тождество доказано.
0-10
-10
0.4(5d-4) - 0.2(17+13d)+0.6 = -5 ;
2d - 1.6 - 3.4 - 2.6d + 0.6 = -5 ;
2d - 5 - 2d = -5 ;
-5 = -5 ;
Тождество доказано.