Sagot :
Réponse :
Exercice n°1:
3(2x+1) = 6x +3
(2x+1) (3x+4) = 6x²+8x + 3x +4 = 6x² + 11x + 4
- ( 1 - x) = -1 + x
-3x (2-5x) = -6x + 15x²
Exercice 2 :
a2 + 3a = a( a +3 )
2a+ 4 = 2a + 2x2
= 2( a +2 )
3a2 + a = a( 3a + 1)
15a + 5a2 = 5x3a + 5x1a2
= 5a (3 + a )
a2 + 3a = a( a +3 )
2a+ 4 = 2a + 2x2
= 2( a +2 )
3a2 + a = a( 3a + 1)
15a + 5a2 = 5x3a + 5x1a2
= 5a (3 + a )