bonjour
15/32 : 20/16
= 15/32 * 16/20
= 240/640
= 3/ 8
9 /16 x 20/54 = 180/864
= 5 / 24
- 1 8 /35 x - 42/28 x - 14/21
= - 10 584 / - 20 580
= 18 / 35
- 10 /36 x - 49/8 x - 24 /42
= 11 760 / 12 096
= 35 / 36
9/7 - 5 /7 x - 21 /35
= 9/7 + 105/ 245
= 9 /7 - 3/ 7
= 6 /7
