Завдання 201 - 300 » 246

Обчисли: 1) 3/8 + 2/9 = (27 + 16)/72 = 43/72; 2) 1/6 + 2/5 = (5 + 12)/30 = 17/30; 3) 2/9 + 11/15 = (10 + 33)/45 = 43/45; 4) 7/12 + 2/9 = (21 + 8)/36 = 29/36; 5) 13/15 – 1/2 = (26 - 15)/30 = 11/30; 6) 9/20 – 13/30 = (27 - 26)/60 = 1/60; 7) 11/16 – 7/12 = (33 - 28)/48 = 5/48; 8) 21/26 – 8/13 = (21 - 16)/26 = 5/26.

Завдання 201 - 300