xk[CîPQj
yPzxLǎ
k^2-(k-1)^2=2k-1
k^3-(k-1)^3=3k^2-3k+1
k^4-(k-1)^4=4k^3-6k^2+4k-1
k^5-(k-1)^5=5k^4-10k^3+10k^2-5k+1
k^2-(k-1)^2=2k-1ӁX
n^2=2S1-S0
l
S0=n
-S0+2S1=n^2
S0-3S1+3S2=n^3
-S0+4S1-6S2+4S3=n^4
S0-5S1+10S2-10S3+5S4=n^5
yQzxk[C̑Q
A
B0=n
-B0+2B1=1
B0-BS1+3B2=0
-B0+4B1-6B2+4B3=0
B0-5B1+10B2-10B3+5B4=0