1. A square root of a positive number, represented by the symbol "_ _ _ _ _ _ _", where A is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

2. The number whose square root equals itself is _ _ _ _ _ _ _ _, and the number whose arithmetic square root equals itself is _ _ _ _ _ _ _ _.

3. _ _ _ _ _ _ has two square roots, _ _ _ _ has only one square root, and _ _ _ _ _ has no square root.

The arithmetic square root of 4.0.25 is _ _ _ _ _.

The arithmetic square root of 5.9 is _ _ _ _ _ _ _ _,

The arithmetic square root of is _ _ _ _ _.

The square root of 6.36 is _ _ _ _ _, if

, then x = _ _ _ _ _ _

7.

The square root of is _ _ _ _ _ _ _ _,

The square root of is _ _ _ _ _ _ _ _,

The arithmetic square root of is _ _ _ _ _.

The square root of 8.8 1 is the square root of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

9.

, then x = _ _ _ _ _ _

When?

When a _ _ _ _ _ _ _,

Meaningful.