小豪和子晴共有零用錢120元
子晴的零用錢是子豪的60%
子晴有零用錢多少元
設子晴有零用錢Y元
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一條數學方程式
2010-05-27 2:17 am
回答 (4)
2010-05-31 2:37 am
小豪和子晴共有零用錢120元
子晴的零用錢是子豪的60%
子晴有零用錢多少元
A. 設子晴有零用錢y元(, 小豪有零用錢(120-y)元).
y+(120-y) = 120
y = 60%(120-y)
y/0.6 = 120-y
y+ y/0.6 = 120
y+ 10y/6 = 120
6y+ 10(6)y/6 = 120*6
6y+10y = 720
16y = 720
y = 720/16
y = 45
所以子晴有零用錢45元.
子晴的零用錢是子豪的60%
子晴有零用錢多少元
A. 設子晴有零用錢y元(, 小豪有零用錢(120-y)元).
y+(120-y) = 120
y = 60%(120-y)
y/0.6 = 120-y
y+ y/0.6 = 120
y+ 10y/6 = 120
6y+ 10(6)y/6 = 120*6
6y+10y = 720
16y = 720
y = 720/16
y = 45
所以子晴有零用錢45元.
參考: No body no body but you
2010-05-31 2:28 am
冇解
小豪, 子晴, 子豪與兩人何干?
小豪, 子晴, 子豪與兩人何干?
2010-05-27 4:16 am
設小豪為x子晴為y
x+y=120....(1)
y=0.6x.......(2)
x=120-y.....(3)
sub 3 into 2
y=0.6(120-y)
y= 72-0.6y
y+0.6y=72
1.6y=72
y=45
x+y=120....(1)
y=0.6x.......(2)
x=120-y.....(3)
sub 3 into 2
y=0.6(120-y)
y= 72-0.6y
y+0.6y=72
1.6y=72
y=45
參考: me
2010-05-27 2:27 am
小豪和子晴共有零用錢120元
子晴的零用錢是子豪的60%
子晴有零用錢多少元
A. 設子晴有零用錢y元(, 小豪有零用錢(120-y)元).
y+(120-y) = 120
y = 60%(120-y)
y/0.6 = 120-y
y+ y/0.6 = 120
y+ 10y/6 = 120
6y+ 10(6)y/6 = 120*6
6y+10y = 720
16y = 720
y = 720/16
y = 45
所以子晴有零用錢45元.
子晴的零用錢是子豪的60%
子晴有零用錢多少元
A. 設子晴有零用錢y元(, 小豪有零用錢(120-y)元).
y+(120-y) = 120
y = 60%(120-y)
y/0.6 = 120-y
y+ y/0.6 = 120
y+ 10y/6 = 120
6y+ 10(6)y/6 = 120*6
6y+10y = 720
16y = 720
y = 720/16
y = 45
所以子晴有零用錢45元.
參考: Myself
收錄日期: 2021-04-23 22:10:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100526000051KK00991