1/a + 1/b = b/a (a)
1/a + 1/b = b/a
ab(1/a + 1/b) = ab(b/a) <---ab係點黎既...
b + a = b^2
a = b^2 - b
change of subject
2008-10-06 7:41 am
回答 (1)
2008-10-07 11:12 pm
✔ 最佳答案
ab係為左方便計算以外加落去ge1/a + 1/b = b/a
↑ ↑
呢兩個分數由於分母不同，唔可以直至相加，
所以係計算的時候，就刻意將成絛數(左右兩邊)乘大ab,變成:
(ab)/a + (ab)/b = ab(b/a)
將分數約簡
↓
b + a = b^2
參考: ME
收錄日期: 2021-04-15 14:44:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081005000051KK03188