Réponses

  • Utilisateur Brainly
2014-04-15T12:49:42+02:00
1) BC = 15/21+5/14 = 15/14

2) 14/25*5/14 = 1/5

3) [(15/14*14/25)/2 = 3/10

4) CF*15/4 = 3/2
     CF = 3/2 divisé par 15/4 = 3/2*4/15 = 12/30 = 4/10 = 2/5

5)BF² = (15/14)²+(2/5)² = 225/196+4/25 = 6409/4900
 BF = V6409/v4900 = 80,06/70 = 1,1437 à arrondir au