Выполни вычисления удобным способом (4).

1. 36 + 18 + 2 + 4 = (36 + 4) + (18 + 2) = 40 + 20 = 60. 2. 27 + 6 + 14 + 3 = (27 + 3) + (6 + 14) = 30 + 20 = 50. 3. 17 + 20 + 40 + 3 = (17 + 3) + (20 + 40) = 20 + 60 = 80. 4. 29 + 50 + 1 + 20 = (29 + 1) + (50 + 20) = 30 + 70 = 100.