Maths problem,how to do , thanks?
回答 (1)
2020-11-29 12:33 pm
✔ 最佳答案
V = kr^2r = 2cm ==> V = 27cm^3
∴ k = V/r^2 = 27/2^2 = 6.75(cm)
V = 168.75cm^3
==> r^2 = 168.75/6.75 = 25 = 5^2
∴ r = 5cm
收錄日期: 2021-04-24 08:05:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20201129021415AAX22N0