Bonjour, J'ai des équations à résoudre : c. 4+3x/5 = 7x-1/8 d. 6-x/3 = 4x+1/2

Réponse :

bonjour,

(4+3x)/5 = (7x-1)/8

(4+3x)/5  - ( 7x - 1)/8 = 0

8(4+3x)/5×8 - 5(7x - 1)/8×5  = 0

(32 +24x) / 40 - (35x - 5)/40 = 0

(32 + 24x-35x + 5)/40 = 0

(-11x+37)/40 = 0

-11x + 37 = 0

-11x = -37

x = -37/-11

x = 37/11

(6-x)/3 = (4x+1)/2

(6-x)/3 - (4x+1)/2 = 0

2 (6-x) / 3×2 - 3(4x+1)/2×3 = 0

(12 - 2x)/6 - (12x +3)/6 = 0

(12 -2x -12x-3)/6 = 0

(-14x + 9 ) / 6 = 0

-14x + 9 = 0

-14x = -9

x = -9/-14

x = 9/14

voila :)