Répondre :
A=3-5x(-4)-1+7x(-3)+5-7
=3+5x4-1-7x3+5-7
=3+20-1-21+5-7
=23-22-2
=23-24
=-1
B= -6-(-2)x5+(-7)x(-1)-3x5
=-6+2x5+7x1-3x5
=-6+10+7-15
=4-8
=-4
=3+5x4-1-7x3+5-7
=3+20-1-21+5-7
=23-22-2
=23-24
=-1
B= -6-(-2)x5+(-7)x(-1)-3x5
=-6+2x5+7x1-3x5
=-6+10+7-15
=4-8
=-4