數學功課百分率~~~ 好多分

👨🏻‍🏫 學術台數學

用戶86933

2007-08-03 5:32 am

假設燕清以$x購入一部相機
(A)燕清把它售予宏光，虧蝕20%。以x表示宏光所付的金額。
(B)宏光把它售予美儀，獲利10%。以x表示美儀所付的金額。
(C)美儀以$2640購入心。燕清虧蝕若干?

回答 (2)

用戶4872

2007-08-03 5:41 am

✔ 最佳答案

(A) 宏光付 = x * (1-20%) = 0.8x
(B) 美儀付 = 0.8x*(1+10%) = 0.88x
(C) 美儀實付 $2640
0.88x = 2640
x = 3000
燕清虧蝕 = 3000*20% = $600

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ka man

2007-08-03 5:45 am

(A) 宏光付 = x * (1-20%) = 0.8x

(B) 美儀付 = 0.8x*(1+10%) = 0.88x

(C) 美儀實付 $2640

0.88x = 2640
x = 3000
燕清虧蝕 = 3000*20% = $600

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