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Laura210
@Laura210
January 2021
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Bonjour
J'aurais besoin d'aide pour ce petit exercice
Merci beaucoup ;)
Bonne fin de journée :)
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scoladan
Verified answer
Bonjour,
1) I = 6 unités d'aire
2) a) soit f une fonction constante positive sur [a;b] : f(x) = k avec k∈R
⇒ F(x) = kx + k' k'∈R
⇒ Somme de a à b de f(x)dx = F(b) - F(a) = (kb + k') - (ka + k') = k(b - a)
b) I = somme de -1 à 1 de 3dx = F(1) - F(-1) = (3 + k') - (-3 + k') = 6 u.a.
Ex 2
1) f(x) = x
2) I = Somme de 0 à 3 de f(x)dx
3) I = 9/2
F(x) = x²/2 + k
⇒ I = F(3) - F(0) = 9/2 - 0 = 9/2
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Verified answer
Bonjour,1) I = 6 unités d'aire
2) a) soit f une fonction constante positive sur [a;b] : f(x) = k avec k∈R
⇒ F(x) = kx + k' k'∈R
⇒ Somme de a à b de f(x)dx = F(b) - F(a) = (kb + k') - (ka + k') = k(b - a)
b) I = somme de -1 à 1 de 3dx = F(1) - F(-1) = (3 + k') - (-3 + k') = 6 u.a.
Ex 2
1) f(x) = x
2) I = Somme de 0 à 3 de f(x)dx
3) I = 9/2
F(x) = x²/2 + k
⇒ I = F(3) - F(0) = 9/2 - 0 = 9/2