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Sagot :

20-13=7
7+5=12
12-4=8
8+1=9
le resultat est 9
= 20 - 13 + 5 - 4 + 1
= 7 
+ 5 - 4 + 1
= 12 - 4 + 1
= 8 + 1
= 9

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