已知Sk=1k+2k+3k+…+nk,当k=1,2,3,…时,观察下列等式:
S1=n2+
n,
S2=n3+
n2+
n,
S3=n4+
n3+
n2,
S4=n5+
n4+
n3-
n,
S5=An6+n5+
n4+Bn2,…
可以推测,A-B=________.
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已知Sk=1k+2k+3k+…+nk,当k=1,2,3,…时,观察下列等式:
S1=n2+
n,
S2=n3+
n2+
n,
S3=n4+
n3+
n2,
S4=n5+
n4+
n3-
n,
S5=An6+n5+
n4+Bn2,…
可以推测,A-B=________.
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