Mathematics, 16.12.2021 23:20 tjiaxin8082

DM de décembre 4ème Exercice n°1:
Un train roule à 150km/h. Au bout d'une heure, il peut augmenter sa vitesse de 10% pendant 1 h 30min,
mais il doit ensuite la réduire de 20% pendant 2 h 30min.
Durant la dernière demi-heure il doit limiter sa vitesse à 100 km/h.
Quelle distance a-t-il parcourue ?
Exercice n°2 :
Les terrains et ont la même aire.
Le terrain (ABCD) est tel que : AD = 52 m: DC = 25 m et BC = 60 m. Le terrain est un carré.
Quel est celui qui a le plus grand périmètre ?
52
D
B
25
60
С

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DM de décembre 4ème Exercice n°1:
Un train roule à 150km/h. Au bout d'une heure, il peut aug...