РЕШИТЕ ЛЁГКИЕ УРАВНЕНИЯ: 1) x - 6x + 5 = 0

Вычислим корешки уравнений.

1) x - 6 * x + 5 = 0;

D = (-3) - 1 * 5 = 9 5  = 4 = 2;

x1 = (-(-3) + 2)/(1) = (3 + 2)/1 =  5/1 = 5;

x2 = (3 2)/1 = 1/1 = 1.

2) x - 5 * x = 0;

x * (x 5) = 0;

x = 0;

x 5 = 0;

x = 0;

x = 5.  

3) 6 * x + x - 7 = 0;

D = 1 - 4 * 6 * (-7) = 1 + 24 * 7  = 1 + 168 = 169 = 13;

x1 = (-1 - 13)/(2 * 6) = -14/12 = -7/6;

x2 = (-1 + 13)/(2 * 6) = 12/12 = 1.  

4) 3 * x - 48 = 0;

3 * (x - 16) = 0;

x - 16 = 0;

x - 4 = 0;

(x 4) * (x + 4) = 0;

x 4 = 0;

x + 4 = 0;

x = 4;

x = -4.