Question

2/3•9/10=
2 3/5•1 9/26=
1 4/9•1 5/13-2 1/12•4/15=

Answer 1

2/3*9/10=3/5

2 3/5*1 9/26
2 3/5=13/5
1 9/26=35/26
13/5*35/26=91/26
91/26=3 13/26

Answer 2

2 3/5*1 9/26

2 3/5=13/5

1 9/26=35/26

13/5*35/26=91/26

91/26=3 13/26