非负数指的是零和正数的统称。初中代数学习中 ,常见的非负数有三类 ,它们是实数的绝对值、实数的平方、非负实数的算术平方根。非负数具有下面几个性质 :1.若干个非负数的和仍为非负数 ,即若 a1 ≥ 0 ,a2 ≥ 0 ,… ,an≥ 0 ,则 a1 +a2 +… +an≥ 0。2 .如果 n个非负数的和等于 Non-negative numbers refer collectively to zero and positive numbers. In the study of junior high school algebra, there are three types of common non-negative numbers. They are the absolute value of a real number, the square of a real number, and the arithmetic square root of a nonnegative real number. Non-negative numbers have the following properties: 1. Some non-negative sums are still non-negative, ie if a1 ≥ 0, a2 ≥ 0,..., an≥ 0, then a1 +a2 +... +an≥ 0. If the sum of n non-negative numbers is equal to