Bonsoir, j'aurais besoins des reponses a ce dm merci

bonsoir

1 = a( b + 2)
2 = a( a + b)
3 = ab( a - 9)
4 = 2 a ( ab + 3 b + 2)
5 = a ( 3 a + 2 b + 1)
6 = a ( 3 a + b - 1)
7 = 5 ( x - 4)
8 = x ( x +1)
9 = 2 x ( 3 x - 1)
10 = x² ( - x + 5)
11 = 5 x ( - 4 x² + x - 2)
12 = x ( x - 1 + 3x) = x ( 4 x -1)
13 = x ( x - 1 - 5 x - 3 x) = x ( - 7 x - 1)
14 = ( x -7) ( x  + x - 2) = ( x -7) ( 2 x - 2)
15 = ( x -3) ( x - 1 + 1) = ( x -3) ( x)
16 = 2 (x-3) ( 3 x - 10 + 1) = ( 2x -3) ( 3 x - 9)
17 = ( x -3) ( x - 3 - 3x - 4) = (x -3) ( - 2x - 7)
18 = ( x -1) ( x -1 - x +1) = ( x -3) ( 0)
19 = (x +1)²
20 = (x - 3)²
21 = ( x -2) ( x +2)
22 =  infactorisable
23 = ( 3 x -1) ( 3 x +1)
24 = ( x + 3 - 4) ( x + 3 +4) = ( x -1) ( x +7)
25 = ( 2 x - 1 + x +4) ( 2 x -1 - x -4) = ( 3 x +3) ( x -5)
26 = (x -5 ) ( x +5) + 2 ( 2 x - 10) ( 2 x +10)
27 = je ne sais pas, peur de me tromper
28 = ( x²- 4) ( x² +4)

OUF !