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Eouicmoi1
@Eouicmoi1
May 2019
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Bjr besoin d’aide pour le 1 et 2 svp merci
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Bonjour,
Ex. 1 :
12,5 % de 240 = 240 × 12,5 ÷ 100 = 30
30 % de 750 = 750 × 30 ÷ 100 = 225
(30 + 225) ÷ (240 + 750) × 100 =
25,75757575......
Ex. 2 :
2) AB² = 10² = 100
AC² + BC² = 8² + 6² = 64 + 36 = 100
AB² = AC² + BC² donc le triangle ABC est rectangle en C
3)
a) (AB × CH) ÷ 2 et (AC × BC) ÷ 2
b) Comme on ne connait pas la mesure de CH, on utilise la formule
(AC × BC) ÷ 2 pour calculer l'aire du triangle ABC
donc : (8 × 6) ÷ 2 = 24 (cm²)
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Ex. 1 :
12,5 % de 240 = 240 × 12,5 ÷ 100 = 30
30 % de 750 = 750 × 30 ÷ 100 = 225
(30 + 225) ÷ (240 + 750) × 100 = 25,75757575......
Ex. 2 :
2) AB² = 10² = 100
AC² + BC² = 8² + 6² = 64 + 36 = 100
AB² = AC² + BC² donc le triangle ABC est rectangle en C
3)
a) (AB × CH) ÷ 2 et (AC × BC) ÷ 2
b) Comme on ne connait pas la mesure de CH, on utilise la formule
(AC × BC) ÷ 2 pour calculer l'aire du triangle ABC
donc : (8 × 6) ÷ 2 = 24 (cm²)