Q：525^2 - 445^2 = 100A
A＝？
唔用計數機，有咩方法可以快d計到？？
525^2 - 445^2 = 100A
2012-01-09 9:29 am
回答 (1)
2012-01-09 10:45 am
✔ 最佳答案
525² - 445² = 100A(525 + 445) x (525 - 445) = 100A
100A = 970 x 80
A = 970 x 80 / 100
A = 97 x 8
A = 776
參考: andrew
收錄日期: 2021-04-13 18:27:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120109000051KK00076