原帖由 {ｃhiｎ} 於 2006-12-20 09:26 PM 發表
本金(1+利率%)^分期 = 總和
咁你年利率係6%..一個月既利率就係6%/12 = 0.5%
而兩年有24個月``即係24期啦..(廢話 -___-`)
5000(1+0.5%)^24
=5635.798881
~
~($)5635.8

第二題..唔係好明 -  -
英文會好D -_-

原帖由 Ｈydro;) 於 2006-12-21 11:08 PM 發表

C = a r^2 + b r^3 (where a,b are real number)
96 = 16a + 64b
3 = a + b
on solving, a = 2, b = 1
=>
C = 2 r^2 + r^3
when r = 2
C = 16
when r = 6
C = 288

the volume of the spare : ( ...