Bonsoir, Pouvez vous m’aider svp Merci

Bonsoir,

2)

L = 1/5 - 3/5 x 1/6 + 1/2

L = 1/5 - 3/30 + 1/2

L = (1 x 2) / (5 x 2) - (3 x 1) / (3 x 10) + (1 x 5) / (2 x 5)

L = 2/10 - 1/10 + 5/10

L = 6/10

L = (2 x 3) / (2 x 5)

L = 3/5

M = (1/5 - 3/10) - (1/6 - 1/2)

M = [(1 x 2) / (5 x 2) - 3/10] - [1/6 - (1 x 2) / (3 x 2)]

M = (2/10 - 3/10) - (1/6 - 2/6)

M = - 1/10 - (- 1/6)

M = (1 x 3) / (10 x 3) + (1 x 5) / (6 x 5)

M = 3/30 + 5/30

M = 8/30

M = (2 x 4) / (2 x 15)

M = 4/15

3)

C = (2x - 1) (x - 5) + (3x + 7) (x - 5)

C = (x - 5) (2x - 1 + 3x + 7)

C = (x - 5) (5x + 6)

4)

(3x + 1) (x - 5) = 0

3x + 1 = 0                 ou                x - 5 = 0

3x = - 1                                          x = 5

x = - 1/3

Réponse :

bonsoir

Explications étape par étape

L=1/5-3/5*1/6+1/2

L = 6/30 - 3/30 +15/30=18/30=3/5

M=(2/10-3/10)-(1/6-3/6)= -1/10 + 2/6=-1/10+1/3=-3/30+10/30=7/30

C=(2x-1)(x-5)+(3x+7)(x-5)=(x-5)(2x-1+3x+7)=(x-5)(5x+6)

(3x+1)(x-5)=0

3x+1=0 3x=-1 x=-1/3

x-5=0 x=5