Bonjour
Calculer A et B en détaillant les étapes intermédiaire
A=(-2+7) x (-2-5) -100:(-4)
A = 5 x (-7) - (25 x 4)/(-1 x 4)
A = 5 x (-7) + (-25)/(-1)
A = -35 + 25
A = -10
B=5/4 - 3/4 X 12/15
B = 5/4 - 3/15 x 12/4
B = 5/4 - 3/(3x5) x (3 x 4)/(1 x 4)
B = 5/4 - 1/5 x 3
B = 5/4 - 3/5
B = (5 x 5)/(4 x 5) - (3 x 4)/(5 x 4)
B = 25/20 - 12/20
B = 13/20