Решите уравнение 2(6.2-2x)+x(6.2-2x)
12.4 - 4x +6.2x - 2x^2 =0 2x^2 -2.2x -12.4 =0 D=(-2.2)2 - 4*2(-12.4)=104.04 X1 = 3.1 X2 = -2