Réponse :
A = (-5) + ((-4)x(-2)+(+7))
A = -5 + (8 + 7) = -5 + 15 + 10
B = (-4)x(-2)x(-3)-(-3)x(-2)
B = -24 - 6 = - 30
C = (+6) - (-9) + (-3)x((-5)x(-2) - 3)
C = 6 + 9 - 21 = -6
D = 7/5x1/2 - 3/10x3/4
D = 7/10 - 9/40 = (4x7)/(4x10) - 9/40 = 28/40 - 9/40 = 19/40
E = (3/2 - 5/4)x2/3 - (7/6 - 1
E = ((3x2)/(2x2) - 5/4)x2/3 - ((7/6) - 6/6))
E = (6/4 - 5/4)x 2/3 - 1/6
E = (1/4)x2/3 - 1/6 = 2/12 - (1x2)/(6x2) = 2/12 - 2/12 = 0
F = (9/4 - 1/2) + 3/2 + 1/3(7/2 - 2)
F = ((9/4) - (1x2)/(2x2)) + (3x2)/(2x2) + 1/3(7/2 - 4/2)
F = (9/4 - 2/4) + 6/4 + 1/3(3/2)
F = 7/4 + 6/4 + 3/6 = 13/4 + 3/6 = ((13x6)/(4x6)) + ((3x4)/(6x4)) =
78/24 + 12/24 = 90/24 = (3x30)/(3x8) = 30/8 = (2x15)/(2x4) = 15/4
Explications étape par étape
