Répondre :
1.Claculer en detaillant les calculs:
-6+16-8-2+26= -6 + (16-8-2+26) = -6 +32 = 26
(-3)+(-9)-(-11)+(+15)-(+20)= [(-3)+(-9)-(-11)]+(+15-20) = (-1)+(-5) = -6
-6+16-8-2+26= -6 + (16-8-2+26) = -6 +32 = 26
(-3)+(-9)-(-11)+(+15)-(+20)= [(-3)+(-9)-(-11)]+(+15-20) = (-1)+(-5) = -6