a) xy,
b) x^2 + y^2
更新1:
if 1/x - 1/y = 1/h and x - y = k express the following in terms of H and K? 編輯
1/x - 1/y = 1/h and x - y = k express the following in terms of H and K?
2016-08-09 6:32 am
1/x - 1/y = 1/h and x - y = k express the following in terms of H and K
a) xy,
b) x^2 + y^2
a) xy,
b) x^2 + y^2
回答 (2)
2016-08-14 5:31 am
a)
1/x-1/y=1/h
(y-x)/xy=h
-k/h=xy
xy=-k/h
b)
x-y=k
x^2 -2xy+y^2=k^2
x^2+y^2=k^2-2(-k/h)
x^2+y^2=(hk^2+2k)/h
1/x-1/y=1/h
(y-x)/xy=h
-k/h=xy
xy=-k/h
b)
x-y=k
x^2 -2xy+y^2=k^2
x^2+y^2=k^2-2(-k/h)
x^2+y^2=(hk^2+2k)/h
收錄日期: 2021-04-18 15:31:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160808223242AAFyWgP