If the volume of a soap bubble decreases by 27.1%,find the percentage decrease in
a)radius
b)surface area
俾條式我就得喇．．ｔｈｘ ａ ｌｏｔ～
又有數學難題喇／＿＼''''''〔都係１０分〕
2007-02-26 2:17 am
回答 (1)
2007-02-26 3:24 am
✔ 最佳答案
a)volume條式, (4/3)PI r^3 =V 用比例計到r細左幾多 再用新r/舊r就出%b) surface area條式 4PI r^2 =A 由a)得知r細左幾多,再用比例計到A細左幾多,新A/舊A出%
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