The denominator of a fraction cannot be zero. If the square root of a fraction is in the real number range, then it must be greater than zero to be meaningful.
Square root refers to the mathematical operation of finding the square root of a number, which is the inverse operation of square.
The root sign is a mathematical symbol. The root sign is a symbol used to represent the root operation of a number or an algebra. If a_=b, then a is the n-th root of b or a is the 1/n power of b, and the n-th handwritten and printed characters are represented by, and the number of roots or algebraic expressions are written in the area surrounded by the left side of the symbol and the right side of the horizontal part above the symbol, which cannot be out of bounds.