bonjour
- 2/3 * - 4/5 = 8/15
7/15 * 5/21 = 1/3 * 1/3 = 1 /9
3 * - 7/6 = - 21 /6 = - 7/2
Réponse :
bonjour,
-2/3 ×4/-5 = -2 ×4/3×(-5) = -8/-15 = 8/15
7/15 ×5/21 = 7×5/15×21 = 7×5/7×3×3×5 = 1/3×3 = 1/9
3 × 7/-6 = 3×7/-6 = 21/-6 = -21/6 = -7 × 3/3×2 = -7/2
voila:)
