亲爱的网友:f(x)=log9(x 8-α/x)在[1,正∞)AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)

问题描述:

亲爱的网友:f(x)=log9(x 8-α/x)在[1,正∞)AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)
A当a=3时A×B=,∴(√a √b) 2;≥0 ∴a b-2√ab≥0

x=1 rcosA,y=-1 rsinA,abs(x) abs(y)