Réponses

2013-11-03T12:29:37+01:00
B = 10^3.10^-4.6/15  2/5.10^-1 = 0,04
C =( (12 - 5)/20) : (5/3) = 7/20x3/5 = 21/100

Meilleure réponse !
2013-11-03T12:31:18+01:00
B=(10^6)*6*(10^-3)/(15*(10^4))
B=(6/15)*(10^6-3-4)=(2/5)*(10^-1)=(2/5)*(1/10)=(2/50)=(1/25)=0,04=4*10^-2

C=((3/5)-(1/4)):(1+(2/3))
C=(12/20)-(5/20)):((3/3)+(2/3))
C=(7/20):(5/3)
C=(7/20)*(3/5)
C=21/100=0,21=21*10^-2