有兩題,最好有解釋
1. W=3(r+s)/r-s (w=5 r=12 s=?)
2. 已知一個半徑為r cm 的球體的體積是V cm3次方 可用以下的公式求得:
V=4/3 π r3次方
空白係乘
若r=3 求V的值 答案以π 表示
3.由此 求一個體積是36πcm3次方的球體的半徑
π係3.14果個
中二數 快!!! (10)
2007-11-20 4:15 am
回答 (3)
2007-11-20 4:28 am
✔ 最佳答案
1.W = 3(r+s)/(r﹣s)5 = 3(12+s)/(12﹣s)
5(12﹣s) = 36+3s
60﹣5s = 36+3s
8s = 24
s = 3
2.V = (4/3)πr3
V = (4/3)π(3)3
V = 36π
3.V = (4/3)πr3
36π = (4/3)πr3
36π÷(4/3)π = r3
r3 = 36×3/4
r3 = 27
r = 3√27
r = 3
所以球體的半徑是3cm
2007-11-20 4:34 am
1.S=3
you just need to 代入去.好易架!
2.V=195333.12
Also,you just need to代入去.very easy.
I don't know are my answer right but i hope i can help you.
2007-11-19 20:44:16 補充：
2.Vis 36TT.Sorry Iam wrong.
you just need to 代入去.好易架!
2.V=195333.12
Also,you just need to代入去.very easy.
I don't know are my answer right but i hope i can help you.
2007-11-19 20:44:16 補充：
2.Vis 36TT.Sorry Iam wrong.
參考: me&calcalator
2007-11-20 4:30 am
1) w = [3(r + s)] / (r - s)
w(r - s) = [3(r + s)]
wr - ws = 3r + 3s
(w-3)r = (w+3)s
(5-3)12 = (5+3)s
24 = 8s
s = 3
2) V = 4/3 π r^3
= 4/3 π (3)^3
= 4π * 9
= 36π
3) 3cm
w(r - s) = [3(r + s)]
wr - ws = 3r + 3s
(w-3)r = (w+3)s
(5-3)12 = (5+3)s
24 = 8s
s = 3
2) V = 4/3 π r^3
= 4/3 π (3)^3
= 4π * 9
= 36π
3) 3cm
收錄日期: 2021-04-13 22:25:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071119000051KK03314