Réponses

Meilleure réponse !
2014-01-19T14:24:59+01:00
A) 1/2 × -2/3 = -3/6 = -1 x 3 / 2 x 3 = -1/2

B) -2/6 × 11/5 = -22/30 = - 2 x 11 / 2 x 15 = -11/15

C) -4/5 × (-7/2) = 28/10 = 2 x 14 / 2 x 5 = 14/5

D) (-7) × (-9/56) = 63/56 = 9 x 7 / 9 x 6 = 7/6

E) 3/14 × (-7/3) = -21/42 = -21 x 1 / 21 x 2 = -1/2

F) (-5/7)² = -5/7 x -5/7 = 25/49