求2 3b2≥λb(a b)三向量AB、BC、CA构成ABC,AB BC CA=03AB BC CA)/2=0x^2-8x 9

问题描述:

求2 3b2≥λb(a b)三向量AB、BC、CA构成ABC,AB BC CA=0
3AB BC CA)/2=0x^2-8x 9

题意不是很明确,把题目写明确点吧!

AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)x| |y-2/1|=0比方∠ACB=90°AB比方AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)