Yes Postgraduate entrance examination mathematics denominator with root sign will deduct points. You can have the root symbol, but the final result can't. If the denominator has a root sign, you will lose points, so switch to the numerator. The denominator can have a root sign, but the answer is best not to write like this. What has a root sign is not necessarily a fraction. Fractions must be rational numbers, and roots will also be irrational numbers.