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@@kamen42 It has many reasons, here are some: 1) calculating a value with a root in the denominator is much harder to do without a calculator (historical reason) 2) having a root in the denominator adds the risk of dividing by zero (if the value under the root contains a variable) 3) having as root in the denominator leads to more rounding issues, because the root's value itself is already rounded in a calculator. if you then divide 1 by that already rounded value, the result is even more rounded.
Having the root only in the denominator is an awful simplification. I would write it as fifth root of 0.2. This expression then only has one operation, where your simplification still has two operations.
