find x
-(5x)/6+(2x)/5 < 1/3
expand/simplify it. Is it a surd?
(√8 - √2)^2
express y in terms of x and z
x^-1 + y^-1 = z^-1
simple maths
2008-06-03 12:31 am
回答 (1)
2008-06-03 1:10 am
✔ 最佳答案
1. -(5x)/6 (2x)/5 < 1/3(-25x 12x)/30 < 10/30
-13x < 10
x > -10/13
2. (√8 - √2)^2
= (√8)^2 - 2(√8)(√2) (√2)^2
= 8 - 8 2
= 2
3. x^-1 y^-1 = z^-1
1/x 1/y = 1/z
1/y = 1/z - 1/x
1/y = (x - z)/xz
xz = y(x - z)
y = xz/(x - z)
最後果條唔肯定..=v=
2008-06-02 17:12:02 補充：
< 是 小於
> 是大於
不好意思亂左碼出唔到..
參考: me
收錄日期: 2021-04-15 15:05:24
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https://hk.answers.yahoo.com/question/index?qid=20080602000051KK01390