13/18 * 7/17 + 2/9 * 7/17 = 7/17(13/18 + 2/9) = 7/17(13/18 + 4/18) = 7/17 * 17/18 = 7/18
(5/11 - 3/22) * 44 = ((10-3)/22) * 44 = 7/22 * 44 = 14
19/20 : 38/5 * 5/16 = 19/20 * 5/38 * 5/16 = 5/128
Одна сторона тре-ка 17/29, значит вторая 17/29 * 4 = 68/29 (м)
17/29 + 68/29 = 85/29 (м) две стороны вместе
143/29 - 85/29 = 58/29 = 2 (м)