Выполните действия: 1) (2/7+5/21): два целых два пятнадцатых 2) (8/11+3/22): 5/11 3) одна целая семь двенадцатых:(3/8+5/12)

1)(2/7 + 5/21) : 2 2/15 = 11/21 : 32/15 = 11/21 * 15/32 = 55/2242 2/15 - переведем в неправильную дробь2 2/15 = 30/15 + 2/15 = 32/152) (8/11+3/22): 5/11 = 19/22 : 5/11 = 19/22 * 11/5 = 19/10 = 1.93)1 7/12 : (3/8+5/12) = 19/12 : 19/24 = 19/12 * 24/19 = 21 7/12 = 12/12 + 7/12 = 19/124) 17/36: (7/12-5/9) = 17/36 : 1/36 = 17/36 * 36 = 175) (3/14+5/7) : 3 5/7 = (3/14+5/7) : 26/7 = 13/7 : 26/7 = 13/7 * 7/26 = 1/2 3 5/7 = 21/7 + 5/7 = 26/76)19/24 : (3/16+ 5/24) = 19/24 : 19/48 = 19/24 * 48/19 = 2