Ответ:√7 ≈ 2,646.√28 = √(4·7) = 2√7 ≈ 5,292.√487 ≈ 22,068.3 + √5 ≈ 3 + 2,236 = 5,236.√18 − √1,2 = 3√2 − √30/5 ≈ 4,243 − 1,095 = 3,147.