1)2x(25x-4)-(5x-2)(5x+1)=8 / 5)\(2\left(x-2\right)-3\left(3x-1\right)=\left(x-3\right)\)

2)x(4x-3)-(2x-2)(2x-1)=5 / 6)\(\frac{2}{x+1}-\frac{1}{x-2}=\frac{3x-11}{\left(x+1\right)\left(x-2\right)}\)

3)\(\frac{5}{2x+3}+\frac{3}{9-x^2}=\frac{8}{7\left(x=3\right)}\) / 7)\(\frac{5x-2}{6}+\frac{3-4x}{2}=2-\frac{x+7}{3}\)

4)\(\frac{2}{3\left(x-2\right)}+\frac{5}{12-3x^2}=\frac{3}{4\left(x+2\right)}\) / 8)\(\frac{2}{x+1}-\frac{1}{x-2}=\frac{3x-11}{\left(x+1\right)\left(x-2\right)}\)

giải các phương trình hệ phương trình sau :

1, ( 2x-1)⁴ + ( 2x + 3 ) ⁴ = 626

2, (3x + 2 ) ⁴ + ( 3x +4)⁴ = 16

3, 16( x - 1 )⁴ + (2x +3 )⁴ = 2

4 , 256( x - 2 )⁴ + ( 4x + 2 ) ⁴ = 2

5 , ( x - 2 ) ( x - 1 ) ( x + 3 ) (x + 4 ) =24

6 , ( x² + 3x +2 ) ( x² + 7x + 12 ) = 24

7 ( x² - 1 ) ( x + 3 ) ( x + 5 ) = 9

8 , x ( x² - 4 ) ( x + 4 ) = 18

9 , ( x² - 3x + 2 ) ( x² - 9x +20 ) = 4

10 , ( x+1 ) ( x + 2 ) ( x + 3 ) ( x + 4 ) = 3

11,( x + 4 ) ( x+ 5 ) ( x + 7 ) ( x + 8 ) = 4

12 , x ( x + 1 ) ( x + 2 ) ( x + 3 ) = 4