Bonjour,
12/14 -9/14
= 3/14
3/4 +35/12 +1/3
= 9/12 +35/12 + 4/12
= 48/12 = 4
( 15/25 -3/25) * 5/4+1
= 12/25 *5/4 +1
= 60/100 -1
=60/100- 100/10
= -40/100 = -4/10 = -2/5
(6/4 -1/4 ) *2/15
= 5/4*2/15
= 8/ /60 = 4/30 = 2/15
