求x的值
-5＝１＋x / 1-x
求x的值
3/9=3x+1 / x-5
a:b=2:3,b:c=4:5,求a:b:c
a:b=1:3,b:c=2:3,求a:b:c
簡單數學題
2007-02-19 5:51 pm
回答 (2)
2007-02-19 6:09 pm
✔ 最佳答案
-5＝(１＋x) /( 1-x)－５（１－ｘ）＝１＋ｘ
５ｘ－５＝１＋ｘ
４ｘ＝６
ｘ＝１．５
3/9=（3x+1） /（ x-5）
（ｘ－５）＝３（３ｘ＋１）
ｘ－５＝９ｘ＋３
－８＝８ｘ
ｘ＝－１
a:b=2:3,b:c=4:5,求a:b:c
a:b= 2:3
b:c= 4:5
ａ：ｂ：ｃ＝８：１２：１５
a:b=1:3,b:c=2:3,求a:b:c
a:b= 1:3
b:c= 2:3
ａ：ｂ：ｃ＝２：６：９
參考: king
2007-02-19 6:10 pm
(1)
-5＝１＋x / 1-x
-6+6x=x
-5x=-6
x=6/5
(2)
3/9=3x+1 / x-5
3x-15=27x+9
24x=-6
x=-1/4
(3)
a:b=2:3,b:c=4:5,求a:b:c
=> 8:12:15
(4)
a:b=1:3,b:c=2:3,求a:b:c
=> 2:6:9
-5＝１＋x / 1-x
-6+6x=x
-5x=-6
x=6/5
(2)
3/9=3x+1 / x-5
3x-15=27x+9
24x=-6
x=-1/4
(3)
a:b=2:3,b:c=4:5,求a:b:c
=> 8:12:15
(4)
a:b=1:3,b:c=2:3,求a:b:c
=> 2:6:9
收錄日期: 2021-04-12 23:19:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070219000051KK00711