(2/17-4/13)-(2/17-2/7)-∣9/13-4/7∣
=2/17-4/13-2/17+2/7-∣9/13-4/7∣
=2/7-4/13-∣9/13-4/7∣(9/13>4/7)
=2/7-4/13-9/13+4/7
=6/7-13/13
=6/7-1
=-1/7
(2/17-4/13)-(2/17-2/7)-∣9/13-4/7∣
=2/17-4/13-2/17+2/7-∣9/13-4/7∣
=2/7-4/13-∣9/13-4/7∣(9/13>4/7)
=2/7-4/13-9/13+4/7
=6/7-13/13
=6/7-1
=-1/7