Решение:
a) `6^2 + 2^2 + 50 : 15 - 20 = 36 + 4 + 50 : 15 - 20 = 40 + 3.33 - 20 = 23.33`
б) `3^3 + 5^2 : 13 * 25 + 150 = 27 + 25 : 13 * 25 + 150 = 27 + 1.92 * 25 + 150 = 27 + 48 + 150 = 225`
в) `4^3 - 3^2 : 11 * 40 - 75 = 64 - 9 : 11 * 40 - 75 = 64 - 0.82 * 40 - 75 = 64 - 32.8 - 75 = -43.8`
г) `2^3 + 9^2 + 21 : 11 * 18 = 8 + 81 + 21 : 11 * 18 = 8 + 81 + 1.9 * 18 = 8 + 81 + 34.2 = 123.2`