MATHS
2006-11-23 5:11 am
if each side of a cube decreases by 10%,find the precentage decreases in its volume.
回答 (1)
2006-11-23 5:26 am
✔ 最佳答案
let x = 原本個正立方體既邊長原本既體積就係x^3 (x*x*x)
而家新既體積就係[(1-0.1)x]^3 =(0.9^3)(x^3)
=0.729x^3
咁precentage decreases=(x^3 -0.729x^3)/x^3 * 100%
=27.1%
希望幫到你
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收錄日期: 2021-04-12 22:32:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061122000051KK04244