x+a
------=c/d
x-b
主項變換x
答案係
x=
ad+bc
--------
c-d
可唔可以例式計比我睇呀@@"點解會係呢個答案..唔該晒!!!
主項變換!!
2007-01-05 3:34 am
回答 (2)
2007-01-05 3:45 am
✔ 最佳答案
(x + a)/(x - b) = c/dd(x + a) = c(x - b) 消除除號
dx + da = cx - cb 刪括號
ad + bc = cx - dx 把同類項合併
ad + bc = x(c - d) 因式分解
(ad + bc)/(c - d) = x 將c - d調到另一方
x = (ad + bc)/(c - d) 把上式寫成x =
參考: me
2007-01-05 3:42 am
(x+a)/(x-b)=c/d
x+a=(x-b)c/d
x+a=cx/d-bc/d
x-cx/d=-bc/d-a
x(1-c/d) = -bc/d-a
x = (-bc/d-a)/(1-c/d)
x=(bc/d+a)/(c/d-1)
x=(bc+ad)/(c-d)
2007-01-04 19:42:43 補充：
最後果度係上下乘個d上去可以寫詳細D
x+a=(x-b)c/d
x+a=cx/d-bc/d
x-cx/d=-bc/d-a
x(1-c/d) = -bc/d-a
x = (-bc/d-a)/(1-c/d)
x=(bc/d+a)/(c/d-1)
x=(bc+ad)/(c-d)
2007-01-04 19:42:43 補充：
最後果度係上下乘個d上去可以寫詳細D
參考: me
收錄日期: 2021-04-12 21:34:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070104000051KK03412