求立方根三題

41781923=347
43986977=353
5802888573=1797
方法是有的,不如我舉個例子,
19立方=6859
那麼可試試10立方=1000
20立方=8000
10立方>6859>20立方

然後可試試尾數,1立方=1
2立方=8
3立方=?7
4立方=?4
5立方=??5
6立方=??6
7立方=??3
8立方=??2
9立方=??9
因9立方=??9的尾數與6859一樣
所以6859的立方根是19

2010-07-17 14:31:33 補充：
我的方法是對的,沒有錯架!!!!!!!!!!!!!!!!!

求以下各數的立方根：
1. 41781923
2. 43986977
3. 5802888573
ans:用四位對數表log&anti log
1.let x^3=41781923
logx 41781923=3
log 41781923 / log x =3
log x =log 41781923 / 3
x=anti log (log41781923 /3)
=347
2.let x^3=43986977
logx 43986977=3
log 43986977 / log x =3
log x =log 43986977 / 3
x=anti log (log43986977 /3)
=353
3.let x^3=5802888573
logx 5802888573=3
log 5802888573 / log x =3
log x =log 5802888573 / 3
x=anti log (log5802888573 /3)
=1797
駛唔借本用,sorry 我無...

咁你應該係題目標明「不可用計算機」吧!

1)41781923=347

2)43986977=353

3)5802888573=1797


i used calculator to find

i cannot think of other method