(299.5)二次方+(199.5)二次方 減 (100.5)二次方-(200.5)二次方=k
則k= ?
收錄日期: 2021-05-01 18:58:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130718000010KK04659