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Math problems in the first grade of junior high school! ! ! !
Correctly understand the relationship between square root, arithmetic square root and negative square root

Square root = arithmetic square root+negative square root

That is, there are two square roots, one is the arithmetic square root and the other is the negative square root.

When a≥0, √a represents the square root of a, √ A represents the arithmetic square root of a, and -√a represents the absolute value of the arithmetic square root of a, that is, the negative square root.

Understand the concept correctly in the future.