(x-0.4)^2?
回答 (2)
2016-03-28 3:33 pm
Since (u - v)² = u² - 2uv + v²
Then, (x - 0.4)²
= x² - 2x(0.4) + 0.4²
= x² - 0.8x + 0.16
Then, (x - 0.4)²
= x² - 2x(0.4) + 0.4²
= x² - 0.8x + 0.16
2016-03-28 3:45 pm
[ x - 0•4 ] [ x - 0•4 ] = x² - 0•8 x + 0•16
收錄日期: 2021-04-18 14:40:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160328073007AAzBYYV