выполните сложение дробей: 28/40+10/75 12/27+14/21 12/24+15/40 12/18+5/60 4/24+3/36

28/40 + 10/75 = (28 * 75)/(40*75) + (10 * 40)/(75*40) = 2100/3000 + 400/3000 = 2500/3000 = 25/30 = 5/6.

12/27 + 14/21 = (12 * 21)/(27*21) + (14 * 27)/(21 * 27) = 252/567 + 378/567 = 630/567 = 1 63/567 = 1 9/81 = 1 1/9.

12/24 + 15/40 = (12 * 40)/(24 * 40) + (15 * 24)/(40*24) = 480/960 + 360/960 = 840/960 = 7/8.

12/18+5/60 = (12 * 60)/(18 * 60) + (5 * 18)/(60 * 18) = 720/1080 + 90/1080 = 800/1080 = 80/108 = = 20/27.

4/24 + 3/36 = (4 * 36)/(24 * 36) + (3 * 24)/(36 * 24) = 108/864 + 72/864 = 180/864 = 20/96 = 5/24.