甲乙丙三人共有280元,其中甲的錢數比乙的錢多50元,且乙的錢數為丙錢數的3倍,則甲有多少錢?
回答 (2)
2016-07-25 3:23 pm
設甲為x，乙為y，丙為z
x+y+z=280
x-y=50
y-3z=0
x=1040/7=148.5714286
甲有148.5714286元
x+y+z=280
x-y=50
y-3z=0
x=1040/7=148.5714286
甲有148.5714286元
2016-07-25 3:37 pm
設甲有3x＋50元，乙有3x元，丙有x元。
··································································
3x＋50＋3x＋x＝280
7x＝230，x＝32又7分之6（元）············丙
32又7分之6×3＝98又7分之4（元）·········乙
98又7分之4＋50＝148又7分之4（元）····甲
··································································
3x＋50＋3x＋x＝280
7x＝230，x＝32又7分之6（元）············丙
32又7分之6×3＝98又7分之4（元）·········乙
98又7分之4＋50＝148又7分之4（元）····甲
收錄日期: 2021-04-18 15:19:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160725060738AAuysDD