Réponse :
Exercice 2
1) 6x[(8-1)x(10-4)]=6x(7x6)=6x42=252
2) (100+10+1)x2=111x2=222
exercice 3:
horizontalement
A=(200×7):(100-1)
=1400:99
=14,14141414
A=14141
B=27×(28+9)
=27×37
B =999
C=(3+4×5)×4
=(3+20)×4 =23×4
=92
C=3+4×5×4
=3+20×4 =3+80
C=83
D=(10+1)×(20-1)×(10-1)
=11×19×9
D=1881
E=(10+1)×(100+1)×(2+1)
=11×101×3
E=3333
a=11×(9×10+7×13)
=11×(90+91)
=11×181
a=1991
b=10000×5-(101×7+10)
=50000-(707+10) =50000-717
b=4928
c=(5×2)+(18÷2)
=10+9
c=19
c=6×29-13×17
=174-91
c=83
d=271:33=0.813
e=133est un multiple de 7 (19×7)
J'espère que ceci vous aidera :) bon courage!!
