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Sagot :

Salut !

1) sur 29 touches

2) 2(19+1) - (10²-1)/9 = 40 - 99/9 = 40 - 11 = 29

3) 4(9999+1) - (10⁴-1)/9 = 40 000 - 9999/9 = 38 889

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