Répondre :
A=3-5*(-4)-1+7*(-3)+5-7
=3+5x4-1-7x3+5-7
=3+20-1-21-2
=23-24
=-1
B=-6-(-2)*5+(-7)*(-1)-3*5
=-6+2x5+7x1-3x5
=-6+10+7-15
=17-21
=-4
=3+5x4-1-7x3+5-7
=3+20-1-21-2
=23-24
=-1
B=-6-(-2)*5+(-7)*(-1)-3*5
=-6+2x5+7x1-3x5
=-6+10+7-15
=17-21
=-4