Répondre :
A=14+8 - (+7) - (+12)
= 14+1-(+12)
=14+-11
=3
B=(-20) + (-7) + (+13 ) + ( +4) + ( - 15)
=-27+17+(-15)
=-10+(-15)
=-25
C= (-11)+(+20)+(+7)-(+5)-(+1)
=9+2-(+1)
=9+1
=10
D= 31-(+24)+(+12)-(+5)-(+8)
=7+7-(+8)
=7+-1
=6
= 14+1-(+12)
=14+-11
=3
B=(-20) + (-7) + (+13 ) + ( +4) + ( - 15)
=-27+17+(-15)
=-10+(-15)
=-25
C= (-11)+(+20)+(+7)-(+5)-(+1)
=9+2-(+1)
=9+1
=10
D= 31-(+24)+(+12)-(+5)-(+8)
=7+7-(+8)
=7+-1
=6