demo1
Equations produit nul (niveau difficile) ⟳
✔ (6r + 5)(r - 3) = 0 ➡ r = -5/6 et r = 3
✔ (5x - 9)(2x + 3) = 0 ➡ x = 9/5 et x = -3/2
✔ (x - 3)(4x + 1) = 0 ➡ x = 3 et x = -1/4
✔ (3x - 4)(x + 5) = 0 ➡ x = 4/3 et x = -5
