Réponse :
Explications étape par étape
Bonjour
E = 40/48 + 105/27 x 90/56
E = (8 x 5)/(8 x 6) + (3 x 35)/(3 x 9) x (2 x 45)/(2 x 28)
E = 5/6 + 35/9 x 45/28
E = 5/6 + 45/9 x 35/28
E = 5/6 + (5 x 9)/9 x (7 x 5)/(7 x 4)
E = 5/6 + 5 x 5/4
E = 5/6 + 25/4
E = (5 x 2)/(6 x 2) + (25 x 3)/(4 x 3)
E = 10/12 + 75/12
E = 85/12
F = (-12/14 + 20/35) x 98/25
F = [(-2 x 6)/(2 x 7) + (5 x 4)/(5 x 7)] x 98/25
F = (-6/7 + 4/7) x 98/25
F = -2/7 x 98/25
F = -98/7 x 2/25
F = -14 x 2/25
F = -28/25
