Bonjours besoin d aide pour exo 2 et 5 merci a bientot math 4eme

Réponse :

Explications étape par étape

Bonjour

Exercice 2 :

Dé | H | E | X | A | G | O | N | E

Ce | O | T | G | A | S | R | S | X

An | 120°|120°|60°|60°|60°|60°|60°|60°

Ar | R | O | T | A | T | I | O | N

Exercice 5 :

Calculer :

A = 2/7 - 3/7 x 14/9

A = 2/7 - 3/9 x 14/7

A = 2/7 - 1/3 x 2

A = 2/7 - 2/3

A = 6/21 - 14/21

A = -8/21

B = -7/8 x (2/3 - 1)

B = -7/8 x (2/3 - 3/3)

B = -7/8 x (-1/3)

B = 7/24

C = 4/5 x 1/4 + 2/5

C = 4/4 x 1/5 + 2/5

C = 1/5 + 2/5

C = 3/5

L = -7/5 / (2/9 - 7/18)

L = -7/5 / (4/18 - 7/18)

L = -7/5 / (-3/18)

L = 7/5 x 18/3

L = 7/5 x 6

L = 42/5

M = (4/5 + -3/2) / (-9/4 - 1/6)

M = (8/10 - 15/10) / (-27/12 - 2/12)

M = (-7/10) / (-29/12)

M = 7/10 x 12/29

M = 7/29 x 12/10

M = 7/29 x 6/5

M = 42/145