Réponses

2013-09-10T18:28:25+02:00
1.A : -10-(-2)+(-8)=-10+2-8=-8-8=-16
B: -13+6-16+3=-8-16+3=-23+3=-20
D: 5*(-2.5)-2*(-5)=-12.5-(-10)=-12.5+10=-2.5
E: 6-2.2*3=6-6,6=-0.6

2.A: 2/3-0.6=2/3-0.6*3/1*3=2/3-1.8/3=0.2/3
B: 11*7/22=77/22
E: 1/2+3/5-(-5/12)=-1*30/2*30+3*12/5*12+5*5/12*5=30/60+36/60+25/60=91/60
F: -3/-5/15= -3*(-15/5)=3*15/5=3*5*3/5=3*3=9