Répondre :
A = - 3/8 : 5/2 + 13/40
=(-3/8) x (2/5)+13/40
=-6/40+13/40
=7/40
B = 8/3 + 2/3 : 5/7
=8/3+2/3 x 7/5
=8/3+14/15
=40/15+14/15
=54/15
=18/5
=(-3/8) x (2/5)+13/40
=-6/40+13/40
=7/40
B = 8/3 + 2/3 : 5/7
=8/3+2/3 x 7/5
=8/3+14/15
=40/15+14/15
=54/15
=18/5