Répondre :
B + C = (-6/5)+2/3
-18/15+10/15
= -8/15
A - D = 15/7-(-4/3)
=45/21-(-28/21)
= 45/21+28+21=73/21
B x A=-6/5 x 15/7
=-90/35 ou -18/7
C + D= 2/3+(-4/3)
=2/3-4/3=-2/3
-18/15+10/15
= -8/15
A - D = 15/7-(-4/3)
=45/21-(-28/21)
= 45/21+28+21=73/21
B x A=-6/5 x 15/7
=-90/35 ou -18/7
C + D= 2/3+(-4/3)
=2/3-4/3=-2/3