Répondre :
Bonjour;
A=-5/12+10/4
-5/12 +10/4*3/3
= -5/12 +30/12
= 25/12
B=7/6-8/5
7/6 *5/5 -8/5*6/6
= 35/30 -48/30
= -13/30
C=21/19+1
21/19+19/19
= 40/19
D=0,7-11/5
= 0,7*5/5 -11/5
= 3,5/5-11/5
= -7,5/5
E=5/2×-10/4
=-50/8 = -25/4
F=15/13×2
= 30/13
G=5/6÷2/-5
= 5/6 *-5/2
= -25/12
H=11/9÷4
= 11/9 *1/4
= 11/36
I=1/2+1/4×1/3-1/6
= 1/2 +1/12 -1/6
= 1/2 *6/6 +1/12 -1/6 *2/2
= 6/12 +1/12-2/12
= 5/12
J=1/2÷(1/3+1/6)
= 1/2 / (1/3*2/2 +1/6)
=( 1/2 )/ (2/6 +1/6)
= (1/2) /(3/6)
= 1/2 *6/3
= 6/6
= 1