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關於數學運算問題,想問一下第一行式子怎麼化簡成第二行式子的
知道的請告知,感謝~
數學運算式子問題
2013-08-14 8:46 am
回答 (2)
2013-08-14 9:03 am
✔ 最佳答案
xy2(y2 - y1) + (1/2)x(y1² - y2²)= -xy2(y1 - y2) + (1/2)x(y1² - y2²)
= -(1/2)•2xy2(y1 - y2) + (1/2)x(y1 +y2)(y1 - y2)
= (1/2)x(y1 - y2) [-2y2 + (y1 + y2)]
= (1/2)x(y1 - y2) [y1 - y2]
= (1/2)x(y1 - y2)²
參考: andrew
2013-08-14 9:07 am
收錄日期: 2021-04-13 19:37:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130814000016KK00197