Array ( [0] => Array ( [title] => L25A [link] => https://www.youtube.com/embed/-kyyXWItUoI ) [1] => Array ( [title] => L25B [link] => https://www.youtube.com/embed/bpAz54mUdIM ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第25R講 7.2 對數函數 part I