URGENT POUR DEMAIN ! 1) Priorités opératoires : Effectue les calculs suivants en respectant les priorités opératoires

A = 4/5 : (-3/7) - 7/10
B = 13/7 + (-8/7) : (-4/5)
C = 7/3 + 3/2 x -10/21
D = 5/8 + (-3/4) : (-9/16)
E= 6/5 - (-1/9) x (-3/4)
F = (3/2 + 3/5) (5/4 - 4/3)
G = (4/3 - 5/2) : (-2/3 + 3/4)
H = 3/2 + 3/5 x 5/4 - 4/3
I = 4/3 - 5/2 : (-2/3) + 3/4

2) Calculez et donner les résultats sous forme d'une fraction irréductible les expressions suivantes :

A = 1/2 + 5/4
B = 2/7 - 4/21
C = 3-5/6
D = 1/30 - 1/20
E = 2/15 + 7/10
F = 2/3 + 3/5
G = -7/2 + 5/6 - 8/3
H = -5/14 + -2/7
I = - -13/15 + -4/5
J = 7/12 + 5/18
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