Réponse :
Bonsoir
Explications étape par étape
D = -5/7 +5/21 X 9/25
D = -5/7 +45/525
D = -5/7 X 75/75 + 45/525
D = -375/525 + 45/525
D = -330/525 : 5/5
D = -66/105 : 3/3
D = - 22/35
E = 25/17 : 15/24 -11/3
E = 25/17 X 24/15 -11/3
E = 600 / 255 -11/3
E = 600/255 -11/3 X 85/85
E = 600/255 - 935/255
E = -335/255 : 5/5 = - 67/51
F = 12 X 10 X (10³)² = 120 X 10⁶ = 5 X 10⁶⁻² = 5 X 10⁴ = 50 000
24 X 10² 24 X 10²
