No.
17 over 20 simplified is 17/20.
It is: 45/1000 = 9/200 simplified
45/63 is 5/7 simplified
53/45 cannot be simplified further.
16/45 cannot be simplified.
It is: 45/171 = 5/19 simplified
It is: 1281/45 = 427/15 simplified
It is: 3/5 simplified
It is 2/9 simplified
8/17 cannot be simplified.
No, -10/17 cannot be simplified.
45/100000 = 9/20000 which cannot be simplified further.