Réponse :
Bonsoir,
Explications étape par étape
A = 25/36 * 81/75
A = (5*5*9*9)/(9*4*5*5*3)
A = 9/12
A = (3*3)/(4*3)
A = 3/4
B = 9/35 : 81/75
B = 9/35 * 75/81
B = (9*5*5*3)/(7*5*9*9)
B = 15/63
B = (5*3)/(3*3*7)
B = 5/21
C = (4-7/3)/(1/6+5/12)
C = (12/3-7/3)/(2/12+5/12)
C = (5/3)/(7/12)
C = 5/3 * 12/7
C = (5*4*3)/(3*7)
C = 20/7
D = 5x + 3 -(2x - 4) + 3(7 - 3x) + 1
D = 5x +3 -2x +4 +21 - 9x + 1
D = -6x + 29
E = (2x - 5) (3x + 2) - (2x -5) ( 4 - 7x)
E = 6x^2 + 4x -15x -10 - (8x -14x^2 -20 +35x)
E = 6x^2 - 11x -10 - 8x +14x^2 +20 -35x
E = 20x^2 - 54x + 10
