la 1°: x
la 2°: 2x
la 3° : x-20
x+2x+x-20 = 104
4x-20 = 104
4x = 104+20
4x = 124
x = 124/4
x= 31
la 1° : 31CHF
la 2°: 2*31 => 62CHF
la 3° : 31-20 => 11 CHF
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Bonsoir;
la 1°: x
la 2°: 2x
la 3° : x-20
x+2x+x-20 = 104
4x-20 = 104
4x = 104+20
4x = 124
x = 124/4
x= 31
la 1° : 31CHF
la 2°: 2*31 => 62CHF
la 3° : 31-20 => 11 CHF