一、非负数正数和零统称非负数.实数的绝对值、实数的偶次幂、实数与其绝对值的和等都是常见的非负数.这些不同类型的非负数常常在代数式、方程中有机地结合在一起. 二、非负数的性质(1)有限个非负数的和或积仍是非负数;(2)有限个非负数的和为零等价于每个非负数为零;(3)有 First, non-negative positive numbers and zero collectively called non-negative numbers. Absolute values ​​of real numbers, even powers of real numbers, and sums of real numbers and their absolute values ​​are common non-negative numbers. These different types of non-negative numbers are often organic in algebraic equations and equations. Combine together. Second, the nature of non-negative numbers (1) The sum or product of a finite number of non-negative numbers is still non-negative; (2) The sum of a finite number of non-negative numbers is equal to zero for every non-negative number; (3) Have