284. г)x^2+x^3=0 д)1-x^3=0 е)1+x^3=0 з)125-x^3=0 285. а)x^3+5x^2+6x=0 в)x^4=2x^3+3x^2 д)x^3-4x^2=x ж)x^5+x^3=x^4

г)x + x = 0 ;

x (1 + x)= 0 ;

x = 0 ;

1 + x = 0 ;

x = 0;

x = - 1.

д)1 - x = 0 ;

- x = - 1 ;

x = 1 ;

x = 1.

е)1 + x = 0 ;

x = - 1 ;

x = - 1.

з)125 - x = 0 ;

- x = - 125 ;

x =125 ;

x = 5 ;

x = 5 .

а)x + 5x + 6x = 0 ;

x (x +5x + 6)= 0 ;

x (x + 3x + 2x + 6)= 0 ;

x (x (x + 3)+ 2(x + 3))= 0 ;

x (x + 3)(x + 2)= 0 ;

x = 0 ;

x + 3 = 0 ;

x + 2 = 0 ;

x = 0 ;

x = - 3 ;

x = - 2 .

в)x = 2x + 3x ;

x - 2x - 3x = 0 ;

x (x - 2x - 3)= 0 ;

x (x (x +1)- 3(x + 1))= 0 ;

x (x + 1)(x - 3)= 0 ;

x = 0 ;

x + 1 = 0 ;

x - 3 = 0 ;

x = 0 ;

x = - 1 ;

x = 3 .

д)x - 4x = x ;

x - 4x - x = 0 ;

x (x - 4x - 1)= 0 ;

x = 0 ;

x - 4x - 1 = 0 ;

x = 0 ;

x = 2 +(5);

x = 2 -(5).

ж)x5 + x = x ;

x5 - x - x = 0 ;

x (x + 1 - x)= 0 ;

x = 0 ;

x + 1 - x = 0 ;

x = 0 .