正数的算术平方根是正数,零的算术平方根是零,即非负数的算术平方根是非负数.表示为(a)1/2≥0(a≥0),可知算术平方根具有双重非负性(被开方数和算术平方根本身都是非负数).初中数学的某些考试中的试题都是根据 The arithmetic mean square of positive numbers is positive, and the arithmetic mean square of zero is zero, that is, the arithmetic square root of nonnegative numbers is nonnegative, which means that (a) 1 / 2≥0 (a≥0), we know that arithmetic square root has double nonnegative Prescriptions and arithmetic square root itself is non-negative.) Some questions in junior high school mathematics exam questions are based on