Réponses

2014-09-23T18:27:02+02:00
A=(3*3/3*14)+(5*2/21*2)=9/42+10/42=19/42

B-(9*5/20*5)-(7*2/50*2)=45/100-14/100=31/100
C-(7*5/8*5)+(5*5/4*5)-(13*8/5*8)
=35/40+25/40-104/40=-44/40