上面说是大学数学专业二年级的内容，那算高等了。我原来的看法是错的

来源: dandinglity 于 2018-09-30 20:41:09 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.