又有數學難題喇／＿＼''''''〔都係１０分〕

2007-02-26 2:17 am

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～

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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