13/5 * 2 4/7 + 2 4/7 * 1 1/10 - 1 7/10 * 1 4/7

1 3/5 * 2 4/7 + 2 4/7 * 1 1/10 - 1 1/10 * 1 4/7 = 8/5 * 18/7 + 18/7 * 11/10 - 11/10 * 11/7 = 144/35 + 18/7 * 11/10 - 11/10 * 11/7 = 144/35 + 99/35 - 11/10 * 11/7 = 144/35 + 99/35 - 121/70 = (144*2 + 99*2 - 121*1)/70 = (288 + 198 - 121)/70 = 365/70 = 73/14 = 5 3/14