Aider mois svp svp svp Exercice1 calculer les expressions suivantes en détaillant les calculs A= 15+3-6+2-7 B= -8+4-5-6+11 C= (+10)-(-4)+(-1)+(+5)-(+9) D= (-15)

Salut!
A= 15+3-6+2-7
=18-6+2-7
=12+2-7
=12-5
=7

B= -8+4-5-6+11
=-4-5-6+11
=-9-6+11
=-15+11
=-4

C=(+10)-(-4)+(-1)+(+5)-(+9)
=10+4+(-1)+5-(9)
=14-1+5-9
=15+5-9
=15-4
=11


D=(-15)-(+14)+(+30)+(-15)-(-20)
(-15)-14+30+(-15)-(-20)
=-29+30+(-15)+20
=1+5
=6

E=21+8x2-[2+(13-9)x3]-(10-6)
=21+16-[2+(13-9)x3]-(10-6)
=37-(2+4x3)-(4)
=37-(2+12)-4
=37-14-4
=23-4
=19

Voilà

A=15+3-6+2-7
A=18-6+2-7
A=12+2-7
A=14-7
A=7
B=-8+4-5-6+11
B=-4-5-6+11
B=-9-6+11
B=-15+11
B=-4
(résultats des 2 premiers)