1) 40/63 - 35/7263 = 3 * 21 = 3 * 3 * 772 = 8 * 9 = 2 * 4 * 3 * 3НОК(63, 72) = 2 * 4 * 3 * 3 * 7 = 72 * 7 = 504 - общий знаменатель40/63 - 35/72 = 320/504 - 245/504 = (320 - 245)/504 = 75/504 = 25/168Ответ: 25/1682) 22/21 - 21/2221 = 3 * 722 = 2 * 11НОК(63, 72) = 2 * 11 * 3 * 7 = 22 * 21 = 462 - общий знаменатель22/21 - 21/22 = 484/462 - 441/462 = (484 - 441)/462 = 43/462Ответ: 43/4623) 40/143 - 41/156143 = 143156 = 2 * 78 = 2 * 2 * 39 = 2 * 2 * 3 * 13НОК(63, 72) = 2 * 2 * 3 * 13 * 143 = 156 * 143 = 22308 - общий знаменатель40/143 - 41/156 = 6240/22308 - 5863/22308 = (6240 - 5863)/22308 = 377/22308Ответ: 377/223084) 43/126 - 41/145126 = 2 * 63 = 2 * 3 * 21 = 2 * 3 * 3 * 7145 = 5 * 29НОК(63, 72) = 5 * 29 * 2 * 3 * 3 * 7 = 145 * 126 = 18270 - общий знаменатель43/126 - 41/145 = 6235/18270 - 5166/18270 = (6235 - 5166)/18270 = 1069/18270Ответ: 1069/182705) 239/240 - 229/288240 = 2 * 120 = 2 * 2 * 60 = 2 * 2 * 2 * 30 = 2 * 2 * 2 * 2 * 15 = 2 * 2 * 2 * 2 * 3 * 5288 = 2 * 144 = 2 * 2 * 72 = 2 * 2 * 2 * 36 = 2 * 2 * 2 * 2 * 18 = 2 * 2 * 2 * 2 * 2 * 9 = 2 * 2 * 2 * 2 * 2 * 3 * 3 НОК(63, 72) = 2 * 2 * 2 * 2 * 2 * 3 * 3 * 5 = 288 * 5 = 1440 - общий знаменатель239/240 - 229/288 = 1434/1440 - 1145/1440 = (1434 - 1145)/1440 = 289/1440Ответ: 289/1440