相关经文
Ekādhikena Pūrvena
“比前一个多一”
用于5结尾数字的平方、特定数字的除法和求倒数
理论
For 15³:
- First: 1 × (1+1) = 2
- Last: 125
- Result: 2|125 = 3375
For 25³:
- First: 2 × (2+1) = 6
- Last: 125
- Result: 6|125 = 15625
步骤
1
Take digit before 5
For 15: n=1
2
Multiply by (n+1)
1×2=2
3
Append 125
2|125=3375
示例
15³
中等1
n=1
1
2
n(n+1)
1×2=2
3
Append 125
3375
答案：3375