睇下依幅圖:
http://upload.wikimedia.org/math/4/3/e/43e407d32599663fde46bfb116cba902.png
依幅圖係來自:
http://en.wikipedia.org/wiki/Probability_density_function
今次個問題同我之前問o個d都好類似:
http://hk.knowledge.yahoo.com/question/?qid=7007101002773
不過今次再想問多個問題,點解條式寫住 d/dx o既?
我仲未知個variable d係咩黎呀
都唔知個佢代表d乜...
既然d/dx 點解唔將佢寫成1/x呀?
總之答晒o既話就40分比晒你呀
唔該晒