(2) There are two different solutions, namely A.
f(x)=0 (x- 1/a)? = 1/a? -1x = 1/a root number (1/a? - 1)
So there is 0.
Solution 0
Solution 1/a- radical sign (1/a? - 1)& lt; 1 root sign (1/a? -1)> 1/a- 1 note1/a-1>; 0 so 1/a? - 1 & gt; 1/a? -2/a+ 1 2/a & gt; Because of a man
Solution 1 < 1/a+ radical sign (1/a? -1) has a root sign (1/a? -1) > 0>1-1/a has been satisfied.
Solve the root sign of 1/a+ (1/a? - 1)& lt; 2 has a root sign (1/a? - 1)& lt; 2- 1/ A Zhi 0 and1/a? - 1 & lt; (2- 1/a)? =4-4/a+ 1/a?
Get a> 1/2 and a >;; 4/5 So there is a & gt4/5.
Comprehensive 4/5