一元一次方程式 - 衛生紙
By Leila
at 2011-02-09T00:00
at 2011-02-09T00:00
Table of Contents
量飯店進行促銷，每人可以一天ㄧ次買3條衛生紙。若元元的媽媽今天買了7條衛生紙，共付533元，已知1條原價衛生紙加1條特價品的價格是148元，則特價衛生紙1條多少元?
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衛生紙
All Comments
By Ula
at 2011-02-12T22:04
at 2011-02-12T22:04
148X3+148-x = 533 => 148是2種衛生紙合起來低錢X3 = 3次2種低錢
=> 148-x = 1條原價衛生紙
=> 533 = 全部價格
444+148-x = 533 => 444 = 3次2種低錢
148-x = 89 => 89 = 533-444
148-89 = x => 89和x 互換位子
x = 58 => 58 = 148-89
A : 特價衛生紙1條59元
By James
at 2011-02-10T10:44
at 2011-02-10T10:44
3[x+148-x]+x=533
3x+444-3x+x=533
444+x=533
x=89
148-89=57 a:57元
2011-02-10 10:57:53 補充：
更正
148-89=59 a:59元
By Edwina
at 2011-02-10T19:32
at 2011-02-10T19:32
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