Решите уравнение(Не теорема Виета) 1)1.3x+0.2=0.7x^2 2)0.09-4x^2=1.6x 3)9x^2+2x-1/3=0...

Question

Решите уравнение(Не теорема Виета)
1)1.3x+0.2=0.7x^2
2)0.09-4x^2=1.6x
3)9x^2+2x-1/3=0
4)0.1x^2-14=-0.4x

Answer 1

1) 1.3x+0.2=0.7x^2
0.7x^2-1.3x-0.2=0
D=1.69+0.56=2.25 √2.25=1.5
x1=0,14 x2=2
2) 0.09-4x^2=1.6x
4x^2+1.6x-0.09=0
D=4 √4=2
x1=-0.45 x2=0.05
3) 9x^2+2x-1/3=0
D=16 √16=4
x1=-0.3 x2=0.1