已知函数. 1.证明:函数是R上的增函数. 2.求函数的值域.

已知函数.

1.证明:函数R上的增函数.

2.求函数的值域.

答案

1.R内任意两个值,,

.

.

,

.

R上的增函数.
2.

,

,

,

.

的值域为.

 

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