小六數學應用題

2008-02-19 6:12 am
請列式計算:

大毛巾2條和小毛巾3條共售$155,大毛巾和小毛巾各一條售$65。問小毛巾一條售多少元?

回答 (3)

2008-02-19 6:20 am
✔ 最佳答案
假設中毛巾價錢是$X,小毛巾是$Y
2X+3Y=155 (1)
X+Y=65 (2)

兩倍(2) 得: 2X+2Y=130 (3)
(1)-(3) 得: Y=25
放Y=25入(2) 得: X=40
表示大毛巾一條40元,小毛巾一條25元

2008-02-18 22:21:37 補充:
樓上的哥仔大毛巾2條和小毛巾3條共售$155共155 = =唔係165
2008-02-19 3:55 pm
2B+3S=155
B+S=65
2B+3S-2(B+S)=155-65*2
S=155-130
S=25

B+25=65
B=65-25
B=40
大毛巾和小毛巾一條售40 and 25$

2008-02-19 17:35:47 補充:
樓上的哥仔(chan.)U said大毛巾2條和小毛巾3條共售$155共155 = =唔係165 Is U wrong?

2008-02-24 10:11:24 補充:
U chose me first ar!
2008-02-19 6:21 am
大毛巾2條和小毛巾2條售$65x2 = $130
大毛巾2條和小毛巾3條共售$155
小毛巾一條售$25


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