Réponses

2014-06-02T11:30:46+02:00
Salut!
1) tu peux soit 5*4+5*6
=20+30
=50
soit 5(4+6)
=5*10
=50
2)7*8-6*8
=56-48
=8
soit 8(7-6)
=8*1
=8
3)7*4-7*3
=28-21
=7
soit 7(4-3)
=7*1
=7
4)9*11-9*9
=99-81
=18
soit 9(11-9)
=9*2
=18
c'est clair ou tu as besoin de plus d'explications?
Meilleure réponse !
2014-06-02T11:32:28+02:00
A)
 5x4+5x6 = 20+30 =50
 5x4+5x6 = 5x(4+6) = 5x10 = 50

b)
7x8-6x8 = 56-48 = 8
7x8-6x8 = 8x(7-6) = 8x1 = 8

c)
7x4-7x3 = 28-21 = 7
7x4-7x3 = 7x(4-3) = 7x1 = 7

d)
9x11-9x9 = 99-81 = 18
9x11-9x9 = 9x(11-9) = 9x2 = 18