12/13-15/26= 9/28-11/35= 39/40-19/28=

Question

12/13-15/26=
9/28-11/35=
39/40-19/28=

Answer 1

1. 24/26-15/26=(24-15)/26=11/26
2. 45/140-44/140=(45-44)/140=1/140
3. 273/280-190/280=(273-190)/280=83/280

Comments

Спасибо)