问题
填空题
已知函数f（x）=
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答案
由y=|f（x）|+k=0得|f（x）|=-k≥0，
所以k≤0，作出函数y=|f（x）|的图象，
由图象可知：要使y=-k与函数y=|f（x）|有三个交点，
则有-k≥2，即k≤-2，
故答案为：k≤-2．
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已知函数f（x）=
|
由y=|f（x）|+k=0得|f（x）|=-k≥0，
所以k≤0，作出函数y=|f（x）|的图象，
由图象可知：要使y=-k与函数y=|f（x）|有三个交点，
则有-k≥2，即k≤-2，
故答案为：k≤-2．
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| In China, most people's names have 1 parts, the family names and the 2 names. Most people may each have many names. For example, when they are very 3 at home, they usually have nicknames (昵称). At school, they use their 4 names. If someone is a writer, he or she has a 5 name. Now new couples (夫妇) are very 6 when they name their children. Most of the names have 7 meanings. Some show their parents' 8 .Girls' names show that their parents want them to be beautiful and nice. 9 names often show their parents want them to be strong; and 10 to the country. | ||||
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