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Sagot :

 Bonsoir,

nbre de courses: x

1)

(3x* 0,80) + 2,30x

2)

20 - (3x* 0,80) + 2,30x

3)

20- 2,4x - 2,30x

=  20 - 4,70x

20 -  [(3*0,80 + 2,30)] *x

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