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Sagot :

5) 8.(5+X)+3
= 40 +8 X +3
=43+8

7.(4-B) +9
=28-7b

(4-b)X7+4,3b-5
=28-7b +4,3b
=28-3,3b

8) n/2
n +1
n -1
1/n .2

12) ne
Choisis deux
2.3= 6
6+5= 11
11.2=22
Et ainsi de suite ..

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