说说y=log0.5(2x2-3x 1)x=1 rcosA,y=-1 rsinA,r>0,A

问题描述:

说说y=log0.5(2x2-3x 1)x=1 rcosA,y=-1 rsinA,r>0,A
x^2-8x 9f(x)=x^5/5-ax^3/3 (a 3)x a^2

a>0,f(x)=loga(x^2-ax)在(-1/2,0)上单调递增因为AD=AB BD=AB BC/2因为f(x)=2-(x分之3)0 (BC CA AB)/2