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Vhbhv12479
@Vhbhv12479
January 2021
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Coucou tout le monde pouvez-vous m'aidez sur cet exercice de math et merci d'avance:
Après une baisse de 8,5%un livre coûte 18,30€.Quelle était son prix avant la baisse?
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trudelmichel
Verified answer
Bonjour,
x le prix intial
x-(x*8.5%)=18.30
x-(x*8.5/100)=1830
x-(x*0.085)=1830
x-0.085x=18.30
x(1-0.085)=18.30
x(0.915)=1830
x=18.30/0.915
x=20
le livre valait 20
vérifions
8.5%de 20
(20x8.5)/100 =170/100=1.7
20-1.7=18.3
3 votes
Thanks 2
mido01
C simple tu fait:
108,5/100*18,30=19,85€
1 votes
Thanks 0
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Verified answer
Bonjour,x le prix intial
x-(x*8.5%)=18.30
x-(x*8.5/100)=1830
x-(x*0.085)=1830
x-0.085x=18.30
x(1-0.085)=18.30
x(0.915)=1830
x=18.30/0.915
x=20
le livre valait 20
vérifions
8.5%de 20
(20x8.5)/100 =170/100=1.7
20-1.7=18.3
108,5/100*18,30=19,85€