demo1
Equations produit nul (niveau difficile) ⟳
✔ (k - 7)(8k + 2) = 0 ➡ k = 7 et k = -1/4
✔ (3x - 4)(x + 5) = 0 ➡ x = 4/3 et x = -5
✔ (2x + 3)(5x - 7) = 0 ➡ x = -3/2 et x = 7/5
✔ (x + 2)(7x - 4) = 0 ➡ x = -2 et x = 4/7
