Ответ:

1) (x-1)(x-3)

2) (x+2)(3x-1)

3) -

4)(8x - 5)(x-1)

5) -

Объяснение:

1) x² -4x + 3 = x² - x -3x + 3 = x(x-1)-3(x-1) = (x-1)(x-3)

2) 3x² + 6x - x - x = 3x(x+2)-(x+2) =  (x+2)(3x-1)

3) -

4) 8x² -13x +5 = 8x² -5 x -8x +5 = x(8x-5)-(8x-5) = (8x - 5)(x-1)

5) -