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!!