不过是烂大街的速算（心算）口诀而已！我小学四年级自己就编过。

来源: 沈成涵于 2014-03-04 18:20:33 [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.