SVP AIDEZ MOI ! JE DOIS RESOUDRE CES FRACTIONS EN DETAILLANT TOUTES LES ETAPES !

A = - 7/18 × (-3)/14 × (-6)

B = 5/4 : 7/12

C = 5/6 × (7/2 - 1/4)

D = (2/3 + 4/5) (3/2 - 7/8)

E = 2/3 - 5/3 × 9/10

F = 1/5 - 2/7 / 1 - 32/49

1

Réponses

2014-10-23T22:25:43+02:00
A = - 7/18 × (-3)/14 × (-6)
= [(-7) X (-3) X (-6)] / (18 X 14)
tu réduis et tu obtiens: [ (-7) X (-3) x (-6) / (3 X 6) X (2 X 7)
= (-1) X (-1) X (-1) / 2
= -1/2

B = 5/4 : 7/12
= (5/4) X (12/ 7)
= 5 X 3/7 
= 15/7

C = 5/6 × (7/2 - 1/4) 
= 5/6 X (14/4 - 1/4)
= 5/6 X 13/4
= 65/24

D = (2/3 + 4/5) (3/2 - 7/8)
= (10/15 + 12/15) (12/8 - 7/8)
= 22/15 X 5/8
= 11/12

E = 2/3 - 5/3 × 9/10
= 2/3 - (3/2)
= 4/6 - 9/6 
= -5/6

F = 1/5 - 2/7 / 1 - 32/49
= (7/35 -10/35)/ (49/49 -32/49)
= (-3/35) / (17/49)
= -21/85