Danny is now 3 times as old as Michael. 5 years ago, Danny was 4 times as old as Michael. 請問Danny今年幾歲。求解及原理!?
回答 (1)
2017-01-05 4:56 am
Sol
設Danny今年x歲，Michael今年y歲
Danny is now 3 times as old as Michael
x=3y
5 years ago，Danny was 4 times as old as Michael
x－5=4(y－5)
3y－5=4y－20
y=15
x=45
設Danny今年x歲，Michael今年y歲
Danny is now 3 times as old as Michael
x=3y
5 years ago，Danny was 4 times as old as Michael
x－5=4(y－5)
3y－5=4y－20
y=15
x=45
收錄日期: 2021-04-30 22:01:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170104162829AAMoiae