[問題] average relative distance !!!!???
大家好 想請問一下
若有兩粒子,分別移動x1,x2
題目問 what is the average relative distance?
有人說就是 ㄏ(x1-x2)^2
*********開根號我用"ㄏ"表示**********
但我完全不懂為甚麼耶 所謂平均就是平方再開根號啊？
還是這是個數學問題= =a
感謝啦
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