实数一章教学、复习时,学生总是对非负数难以理解,更谈不上灵活应用,笔者通过平时的教学实践与积累,对非负数性质问题作如下小结非负数的性质有|a|0、a20、槡a(a0)0、若|槡a|+b+c2=0则a=b=c=0.根据以上性质,不外乎有三个应用1.直接应用2.应用转化3.转化应用.一、直接应用 When teaching and reviewing real numbers in one chapter, students are always difficult to understand about non-negative numbers, let alone flexible applications. The author makes a brief summary of non-negative nature problems through the usual teaching practice and accumulation as follows. |0, a20, 槡a(a0)0, if |槡a|+b+c2=0 then a=b=c=0. Based on the above properties, there are no more than three applications. Direct application 2. Application conversion 3. Conversion application. I. Direct application