f'(x)=[xf'(x)-f(x)]/x^2<； =0
∴F(x) has not increased.
∴f(a)>； =F(b)
Namely: f (a)/a >; =f(b)/b
Get cross multiplication: af (b)
Do math calmly tomorrow. If not, don't panic, you will win. Bless you:
The college entrance examination was successful!
Teacher's list of good deeds 1
She is "Miss Liu" in our class. She is kind and tolerant, earnest and patient, and sometimes gentle and sometimes se