Aidez moi s'il vous plaît !

A= -2 / 9 + 11/6
A=


B= -7/4 - 1/10
B=-74/40

C= - 2/15 - 4
C=-62/15

D= -7/6 - 14/15
D= 103/30

E= 4/5 - 2/3 + 7/2
E=109/30

F= - 5/9 + 1/4 - 15/10 + 4/5
F=39/20

A ) -2/9+11/6 = -2*6/9*6+11*9/6*-9 = -18+99/54 = -81/54 =  3/2
B ) -7/4-1/10 = -7*10/4*10-1*4/10*4 = -70-4/40 = -74/40 = -37/20
C) -2/15-4 = -2*1/15*1-4*15/1*15 = -2-60/15 = -62/15 
D ) -7/6-14/15 = -7*15/6*15-14*6/15*6 = -105-84/90 = -189/90 = -21/10
E ) 4/5-2/3+7/2 = 4(3*2)/5(3*2)-2(5*2)/3(5*2)+7(5*3)/2(5*3) = 24-20+105/30 = 109/30