百分法！中二數學！得一題炸！
2007-11-01 7:01 am
小明用左＄２８０００００買左一架車。之後用ｘ％的虧蝕百分率賣俾大明。之後大明又用２５％的盈利百分率轉賣俾小花。如果小花要俾＄３１５００００先買到架車，求ｘ的值。
回答 (6)
2007-11-01 7:11 am
✔ 最佳答案
2800000 x (1 - X%) x (1 + 25%) = 31500002800000 x (1 - X%) = 3150000 / 1.25
(1 - X%) = 2520000 / 2800000
X% = 1 - 0.9
X = 0.1 x 100
X = 10
參考: myself
2007-11-02 3:51 am
[(2800000)(X)][1+25%]=3150000
(2800000X)(125%) =3150000
2800000X =3150000/125%
X =2520000/2800000
X =0.9
X =90%
所以ｘ的值是90%
2007-11-01 19:52:55 補充：
最後2 STEP X =0.9 X 100X =90%
(2800000X)(125%) =3150000
2800000X =3150000/125%
X =2520000/2800000
X =0.9
X =90%
所以ｘ的值是90%
2007-11-01 19:52:55 補充：
最後2 STEP X =0.9 X 100X =90%
參考: 來自中一的我RAYMOND
2007-11-01 7:45 am
2800000 x (1-x%) x (1+25%) = 3150000
1-x% = 3150000/ 2800000/ ( 1+25%)
1-x% = 3150000/ 2800000/ (100%+25%)
1-x% = 3150000/ 2800000/ 125%
1-x% = 3150000/ 2800000 x 100/ 125
1-x% = 0.9
100% -x% = 90%
100% -90% = x%
10% = x/ 100
10/ 100 x 100 = x
x = 10
*** ｘ的值是10 ***
1-x% = 3150000/ 2800000/ ( 1+25%)
1-x% = 3150000/ 2800000/ (100%+25%)
1-x% = 3150000/ 2800000/ 125%
1-x% = 3150000/ 2800000 x 100/ 125
1-x% = 0.9
100% -x% = 90%
100% -90% = x%
10% = x/ 100
10/ 100 x 100 = x
x = 10
*** ｘ的值是10 ***
2007-11-01 7:12 am
[2800000 x (1-x%)] x (1+25%) = 3150000
[2800000 x (1-x%)] x 125/100 = 3150000
2800000 x (1-x%) = 3150000 x 100/125
2800000 x (1-x%) = 2520000
(1-X%) = 2520000 / 2800000
(1-X%) = 0.9
100% - x% = 90%
x=10
[2800000 x (1-x%)] x 125/100 = 3150000
2800000 x (1-x%) = 3150000 x 100/125
2800000 x (1-x%) = 2520000
(1-X%) = 2520000 / 2800000
(1-X%) = 0.9
100% - x% = 90%
x=10
2007-11-01 7:10 am
[(2800000)(1-x%)](1+25%)=3150000
(2800000)(1-x%)=2520000
1-x%=0.9
1-x%=90%
x=10
(2800000)(1-x%)=2520000
1-x%=0.9
1-x%=90%
x=10
2007-11-01 7:09 am
$3150000/1.25=$2520000
$2520000/$2800000=0.9
0.9 x 100= 90%
$2520000/$2800000=0.9
0.9 x 100= 90%
收錄日期: 2021-04-13 15:02:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071031000051KK04470