Réponses

2013-10-13T21:54:32+02:00
(18-24+3) - (-7-13+23)= -3-(+3)= -3-3=-6
(-15+8)+(-7-5)-(17-20)= -7+(-12)-(-3)= -7-12+3=-16
ex 6 
-5 x (4-6) x (-6+9)= -5*(-2)*3=10*3=30
(5-11) x (-8+12) x (3-6 ) = -6*4*(-3)= 18*4=72
2013-10-13T21:56:11+02:00
(18-24+3)-(-7-13+23)=(-3)-(3)=-3-3=-6
(-15+8)+(-7-5)-(17-20)=(-7)+(-12)-(-3)=-7-12+3=-16
-5x(4-6)x(-6+9)=-5x(-2)x3=-5x-6=30
(5-11)x(-8+12)x(3-6)=(-6)x4x(-3)=72