147/149−15/22+21/149−7/22 = (147/149 + 21/149) - (15/22 + 7/22) = 168/149 - 22/22 = 1 19/149 - 1 = 19/149
(19/24+21/24)−(11/24+17/24)=40/24 - 28/24 = 12/24 = 1/2 = 0,5
61/64−(x−15/64)=52/64
х-15/64= 61/64-52/64
х-15/64=9/64
х=9/64+15/64
х=24/64 = 3/8 = 0,375
10/11-5/11-1/11 = 4/11 ≈ 0,363636.......≈0,4