Réponses

2013-05-30T20:29:45+02:00
A=(3/5)^2-(2/5)
A=(9/25)-(2/5)
A=(9/25)-(10/25)=-1/25

B=(3/7)+(6/7)*(1/3)
B=(3/7)+(2*3)/(7*3)
B=(3/7)+(2/7)
B=5/7

C=(4*10^(12)*1,5)/(9*10^(11))
C=(4*1,5/9)*10^(12-11)
C=(6/9)*10^1
C=(2/3)*10
C=20/3