求函数f(x)=的反函数.

求函数f(x)=的反函数.

答案

思路解析:本题中的函数是分段函数.求反函数时可分段求,得到的反函数仍是分段函数.

:由y=x2-1(x≥0),得x=

.

故y=x2-1(x≥0)的反函数是y=

(x≥-1).

由y=2x-1(x<0),得x=

.

故y=2x-1(x<0)的反函数是y=

(x<-1).

所以所求反函数为f-1 (x)=

方法归纳

对分段函数求反函数的方法是:在每一段上分别求它们的反函数,再写成一个分段函数的形式.


相关题目

It is not who is right but what is right ______ is of importance. A.which 
It is not who is right but what is right ______ is of importance. A.which           B.it        C.that          D.this
 BP will continue to be focused on making sure that the costs ________with oil
 BP will continue to be focused on making sure that the costs ________with oil spill cleanup in the Gulf of Mexico are paid. A.covered           B.filled               C.occup
硝酸是一种重要的化工原料,工业上一般以氨气为原料来制
硝酸是一种重要的化工原料,工业上一般以氨气为原料来制备硝酸。请回答: (1)氨气催化氧化的化学方程式为                         
 — Tom knocked into the banisters(栏杆)last night while driving, but he
 — Tom knocked into the banisters(栏杆)last night while driving, but he is all right. — He is lucky. He        himself badly. A. might injure       B. could have injured  
2.下列句中没有错别字的一项是(     ) A.人到了中年
2.下列句中没有错别字的一项是(     ) A.人到了中年便时有闲愁,怪不得词人会感叹年华一瞬,容消金镜,壮志不再,我也不免有些感触。B.罗
量取15mL液体,应选用的一组仪器是( ) ①5mL量筒  ②10mL量
量取15mL液体,应选用的一组仪器是( ) ①5mL量筒  ②10mL量筒  ③20mL量筒  ④胶头滴管. A.①   B.③④ C.③   D.②④
She could have given us a better impression,but she ______ a very short mini s
She could have given us a better impression,but she ______ a very short mini skirt. A.wear  B.wears  C.wore   D.is worn
以下说法正确的是( ) A.变瘪的乒乓球放入热水中鼓起来
以下说法正确的是( ) A.变瘪的乒乓球放入热水中鼓起来,是由于分子受热变大 B.硝酸钾和磷酸氢二铵都属于复合肥料 C.电解水实验证明了水是由

最新题目