请问：f（x）=xlnx（a-1）x1/2×2/3×3/4×4/5×…×98/99×99/100∠ACB=90°ABABBCCA=0

Question

请问：f（x）=xlnx （a-1）x1/2×2/3×3/4×4/5×…×98/99×99/100
∠ACB=90°ABAB BC CA=0

Answer 1

loga[(x2^2-ax2)/(x1^2-ax1)]>0比方AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)比方f（x）=（根号下x^2-3x-4）/x 1a3 2a2b ab2-2a2b-ab2 b3