Use identities to find the values of the following.
1. 108^2 - (16)(108) + 63
Maths!!!
2008-11-23 9:17 pm
回答 (2)
2008-11-24 12:37 am
✔ 最佳答案
108^2-16*108+63=108^2-2*8*108+8^2-1......(a-b)^2=a^2-2ab+b^2
=(108-8)^2-1
=100^2-1.......都可以再用a^2-b^2=(a+b)(a-b)，不過唔用會快D
=9999
參考: ME
2008-11-23 9:28 pm
將108代為"x"便可將算式化為2次方程
=x^2-16x+63
=(x-9)(x-7)
=(108-9)(108-7)
=(99)(101)
=9999
=x^2-16x+63
=(x-9)(x-7)
=(108-9)(108-7)
=(99)(101)
=9999
參考: 自己
收錄日期: 2021-05-01 19:11:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081123000051KK00865