l數學問題

2008-02-19 3:27 am

爸爸用688元買了一雙原價800元的皮鞋,折扣是多少?

回答 (5)

2008-02-19 3:33 am

✔ 最佳答案

800(1-x)=600
1-x=0.75
x=0.25
x=25%
所以折扣是25%

2008-02-18 19:41:10 補充：
sorry，我睇錯左，睇左600，應該係咁做：設x為折扣800(1-x)=6881-x=0.86x=0.14所以係等於14%即係86折

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2008-02-19 4:49 am

方程式:
設折扣是x
800(1-x)=688
1-x=0.86
x=0.14
so=14%
或...
計算:
[ (800-688) / 800 ] x 100%
= 14%

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2008-02-19 3:58 am

設x為折扣

800(1-x)=688
1-x=0.86
x=0.14
所以等於14%

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2008-02-19 3:39 am

設x%為該折扣

$800(1-x%)=$688
(1-x%)=$688/$800
x%=1-0,86
x=14%

參考: meself

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2008-02-19 3:35 am

(New - Old ) / Old x100%
= [ (800-688) / 800 ] x 100%
= 14%

參考: myself

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