1加3加5加7加9加11加13加15加17加19加.加99
1+3+5+…+99
=(1+99)*50/2
=2500
19又5分之4+199又5分之4+1999又5分之4+5分之3
計算!遞等式!
首先把末尾的5分之3,換成3個5分之1
分別和前邊3個數位相加:19又5分之4+5分之1=20,後兩個數位依次可以得到等於,2002000
遞等式的最終結果就是:20+200+2000=2220
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