已知数列{an}满足an+1=2an+n+1(n属于N*) (1)若数列{an}是等差数列,求它的首相和公差;(2)证明:数列{an}不可能是等比数列; (3)若a1=-1,cn=an+kn+b(n∈N*),试求实数k和b的值,使得数列{c
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