(2x-1)(4x+2x+1)-8x(x+1)=3x+4 (x+2)-x(x+5)-(x+1)(x-1)= 0 x+y+2xy(x+y) (3a-0,6) 27c-125 8x+12xy+6xy+y x+8 (a+2)(a-2x+4)-8 (a-b)-a

Решим уравнения:

1) (2 * x - 1) * (4 * x + 2 * x + 1) - 8 * x * (x + 1) = 3 * x + 4;   

8 * x - 1 - 8 * x  - 8 * x = 3 * x + 4; 

-1 - 8 * x = 3 * x + 4; 

-8 * x - 3 * x = 4 + 1; 

-8 * x - 3 * x = 5; 

-11 * x = 5; 

x = -5/11. 

2) (x + 2) - x * (x + 5) - (x + 1) * (x - 1) = 0;  

x + 4 * x + 8 * x + 8 - x - 5 * x - x + 1 = 0; 

-2 * x + 8 * x + 9 = 0;  

x1 =  2 + 0.534; 

x2 =  2 - 0.534. 

Упростим выражения:

3) x + y + 2 * x * y * (x + y) =  (x + y) * (x + x * y + y); 

4) (3 * a - 0,6) = (3 * a - 0.6) * (9 * a + 3.6 * a + 0.36); 

5) 27  * c - 125 = (3 * c) - 5 = (3 * c - 5) * (9 * c + 15 * c + 25); 

6) 8 * x + 12 * x * y + 6 * x * y + y = (2 * x + y); 

7) x + 8 = (x + 2) * (x - 2 * x + 4); 

8) (a + 2) * (a - 2 * a + 4) - 8 = a + 8 - 8 = a; 

9) (a - b) - a = (a - b - a) * ((a - b) + a * (a - b) + a) = -b * (a - 2 * a * b + b + a - a * b + a) = -b * (3 * a - 3 * a * b + b).