实数中不小于零的数为非负数,我们学过的非负数,用代数式表示常见的有|a|、a~2、a~(1/2),要注意a~(1/2),它是一个双非负数,其中a与a~(1/2)本身都是非负数,非负数有个非常重要的性质,就是“若干个非负数的和为0,则每个加数必为0.”例如,若a~(1/2)+|b|+c~2=0,则a=0,6=0,c=0.非负数在求代数式的值、比较实数的大小、判定一元二次方程根的情况、求函数的最值等诸多方面有着广 The number of not less than zero in the real number is non-negative, we have learned non-negative numbers, using algebraic expression of a | a |, a ~ 2, a ~ (1/2), pay attention to a ~ It is a double non-negative number, where a and a ~ (1/2) are all non-negative numbers. Non-negative numbers have a very important property, that is, “the sum of several non-negative numbers is 0, 0. ”For example, if a ~ (1/2) + | b | + c ~ 2 = 0, then a = 0,6 = 0, c = 0. Non-negative in the algebraic value, the size of the real , Determine the root of a quadratic equation situation, find the value of the function and many other aspects of a wide