Réponses

2012-11-18T14:55:08+01:00

(1/3 x 6/5 - 3/10) x 14/4

=(1x6 / 3x5 -3/10)x 14/4

=(6/15 -3/10)x14/4

=(6x10/15x10 - 3x15/10x15) x14/4

=(60/150 - 45/150) x14/4

=(15/150) x 14/4

=( 15x1/15x10) x14/4

"tu barre les deux 15"

=1/10 x 14/4

=1x14/10x4

=14/40

=2x7/2x20

" tu barres les deux 2"

=7/20