x-1/y=3,xy+1/xy=39, 求y-1/x=?
回答 (1)
2016-09-11 2:41 am
(x-1)/y=3
x-1=3y
x-3y=1 i
(xy+1)/xy=39
xy+1=39xy
38xy=1 ii
x=1.073539335 or x=-0.073539334
y=0.024513111 or y=-0.357846444
(y-1)/x
=(0.024513111-1)/1.073539335
=-0.908664319
or
(y-1)/x
=(-0.357846444-1)/-0.073539334
=18.46421987
x-1=3y
x-3y=1 i
(xy+1)/xy=39
xy+1=39xy
38xy=1 ii
x=1.073539335 or x=-0.073539334
y=0.024513111 or y=-0.357846444
(y-1)/x
=(0.024513111-1)/1.073539335
=-0.908664319
or
(y-1)/x
=(-0.357846444-1)/-0.073539334
=18.46421987
收錄日期: 2021-04-18 15:32:11
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160909001925AAhNhev