已知f(x)=log以a 為底(a>0,a不等于1),當(dāng)0
優(yōu)質(zhì)解答
1/2[f(x1)+f(x2)]=log根號(x1*x2);
接下來是A的區(qū)間問題
f(x1+x2/2)=log(x1+x2/2)>log(2*根號(x1*x2)/2)或
f(x1+x2/2)=log(x1+x2/2)0還是<0;如果f(x1+x2/2)=log(x1+x2/2)>log(2*根號(x1*x2)/2)log(2*根號(x1*x2)/2)-log根號(x1*x2);如果f(x1+x2/2)=log(x1+x2/2)