唔該教教我PLX..
更新1:
V = 2/3 x π(r-1)³ 1152π = 2/3 x π(r-1)³ 1728 = (r-1)³ 去到呢到我都識計.. 但想問下.. 點解無啦啦變左r = 13cm 你點整走個3次方???
更新2:
唉..我終於係計數機搵到個可以開方3既制啦-.-" 原來係shift+x3次果個制..thx哂
關於圓既問題..
2007-12-29 9:21 am
http://upload.ysk.hk/upload/photo/200712-1198861203-CFHTXZez23.bmp
唔該教教我PLX..
唔該教教我PLX..
回答 (2)
2007-12-29 9:52 am
✔ 最佳答案
你上一問題果度已經答左你喇.V = 2/3 x π(r-1)³
1152π = 2/3 x π(r-1)³
1728 = (r-1)³
r = 13cm
如果依圖上的r值是13 + 1 = 14cm
因為13cm 係內半徑, 個容器厚1cm.
2007-12-29 13:02:51 補充：
睇返你條題目, 有D問題:計半球體體積既公式係 V = 2/3 x π(r)³, 咁內半徑係12, 外半徑係13.但題目 V = 2/3 x π(r-1)³ 係用黎計個容器的容量. 個內半徑係(r-1) 外半徑係r即係內半徑係13, 外半徑係14.
2007-12-29 11:23 am
So easy! 可能是你一時太心急看漏了！
1728 = (r-1)³
12³ = (r-1)³
12 = r-1
r = 12 + 1
r = 13 (ans)
1728 = (r-1)³
12³ = (r-1)³
12 = r-1
r = 12 + 1
r = 13 (ans)
收錄日期: 2021-04-23 17:33:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071229000051KK00363