Listen to 快乐学算术 (开场白) online. 快乐学算术 (开场白) is a Chinese language song and is sung by 思嘉姐姐. 快乐学算术 (开场白), from the album 快乐学算术, was released in the year 2013. The duration of the song is 0:45. Download Chinese songs online from JioSaavn.