|
Elite Member
|
引用:
|
作者ccl59888
有一對父子現在的年齡和x歲,則
1.五年前父子年齡合是_____歲?------Ans: x-5
2.若5年前父親年齡是兒子年齡的7倍,則當時兒子____歲?
3.承第2題,兒子現在____歲?
好吧
我承認我高中數學太爛
上來求教
請問2跟3該如何寫?
感恩
|
1. 假設 "現在" 父親為A歲, 兒子為B歲
A+B=X
五年前, 父親為A-5歲, 兒子為B-5歲
A-5+B-5 = A+B-10 = X-10 .... 答案1
若5年前父親年齡是兒子年齡的7倍,則當時兒子____歲?
A-5 = 7 (B-5)
A-5+B-5 = X-10
7B-35+B-5 = X-10
8B-40 = X-10
8 (B-5) = X-10
B-5 = (X-10) / 8 ..... 答案2
另~
8B = X+30
B = (X+30) / 8 .... 答案3
__________________
「往哪兒走？如果每個台灣人都好像他們一樣，就沒得救了！台灣沒得救了！走不了的啦。走到哪兒去？走不了了...」
https://pcdvd.com.tw/showpost.php?p=1087539637&postcount=11439
https://www.pcdvd.com.tw/showthread.php?t=1199128&page=12&pp=10
我期待的不是穴 而是有妳的洞舔
我期待的不是液 而是和妳的慾奸
我期待煙花漫天 我可以永遠不怕妳捉奸
我期待的不是一句抱歉
免費貼圖
https://home.gamer.com.tw/creationDetail.php?sn=6146343
https://www.youtube.com/watch?v=GaJ3FsfHOXE
https://www.youtube.com/shorts/WY3Jg_p8Wkk
https://www.youtube.com/watch?v=v3OF2ehgngI
https://www.youtube.com/shorts/ChnMCmPGNsY
https://www.youtube.com/watch?v=84a4Opj2aQM
https://www.youtube.com/watch?v=jYcb5D5Vrxs
https://www.youtube.com/watch?v=qkkbyiMrPTw
https://www.youtube.com/watch?v=6YAjUM77930
https://www.youtube.com/watch?v=vClBg_WMEYY
https://www.youtube.com/shorts/HiT_3SPDxG0
https://www.youtube.com/watch?v=_reqm2SGLxQ
https://www.youtube.com/shorts/JLvdp3aozxE
https://www.youtube.com/shorts/rtZ9qQ1hdwM
https://www.youtube.com/shorts/oiqHRhSmho8
https://www.youtube.com/shorts/GcsYl6xemoQ
https://www.youtube.com/shorts/UDua-34TR0g
https://www.youtube.com/watch?v=0-Fs9hdFHCE
https://www.youtube.com/shorts/VJnWRGGz9-o
https://www.youtube.com/watch?v=N2UL79895DM
https://www.youtube.com/shorts/hQBfSMvMUJY
https://www.youtube.com/watch?v=0jv1om30VHc
https://www.youtube.com/shorts/6VVoj5MMob4
|