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.
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.
完形填空。 | ||||
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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