1+y 1-x
__________=_________
1-y 1+x
1+x
y= --------
1-x
中二數學問題要步驟!!!!!!!!!!!!!!!!!!!
2009-09-27 2:18 am
回答 (1)
2009-09-27 2:42 am
✔ 最佳答案
(1 + y)/(1 - y) = (1 - x)/(1 + x)(1 + y)(1 + x) = (1 - x)(1 - y)
1 + x + y + xy = 1 - x - y + xy
x + y = - x - y
2x = -2y
x = -y
y = (1 + x) / (1 - x)
y(1 - x) = 1 + x
y - xy = 1 + x
y - 1 = x + xy
y - 1 = x(y + 1)
x = (y - 1) / (y + 1)
收錄日期: 2021-04-23 23:25:38
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090926000051KK01469