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Sagot :

20-(3fois1,40+ 5 fois 1,10)
20-(4,20+5,50)
20-9,70
10,30€
LKILL

Le vendeur lui rend 10.3 euros

(1.40 x 3) + (1.10 x 5) = 9.7

20 - 9.7 = 10.3

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