Bonjour
Il faut factoriser au maximum chaque expression.
1. -24b²+28 = 4 (- 6b² + 7)
2. -28a+21 = 7 (- 4a + 3)
3. 8y+8 = 8 (y + 1)
4. -15y²+35y = 5y (- 3y + 7)
5. 54x²-18x = 18x (3x - 1)
6. 24a²+24 = 24 (a² + 1)
7. 20y-10 = 10 (2y - 1)
8.24x+15 = 3 (8x + 5)
9. 35a+21 = 7 (5a + 3)
10. 42y-36 = 6 (7y - 6).