Réponses

2012-09-09T11:17:22+02:00

A=7/5-3/5x4/21

A=7/5-3/5x4/3x7

A=7/5-1/5x4/7

A=7/5-4/35

A=49/35-4/35

A=45/35=9/7

 

 

B=3/4+1/4x2/3+1/3

B=3/4+1/2x2x2/3+1/3

B=3/4+1/2x1/3+1/3

B=3/4+1/6+1/3

B=9/12+2/12+1/3

B=11/12+1/3

B=11/12+4/12

B=15/12=5/4