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A.1項                  B.k項                C.2^k-1項           D.2^k項

A.1+＜2                                 B.1+=2

C.1+＜2                                       D.1+＜3

A.2k+1                  B.            C.2(2k+1)         D.

A.假設(shè)n=2k+1時正確,再推n=2k+3時正確

B.假設(shè)n=2k-1時正確,再推n=2k+1時正確

C.假設(shè)n=k時正確,再推n=k+1時正確

D.假設(shè)n≤k(k≥1)時正確,再推n=k+2時正確(以上k∈N^*)

A.a_k+                                  B.a_k+

C.a_k+                                  D.a_k+

A.n+1                   B.n                   C.n-1              D.n-2

(1)當n=1時,≤1+1,不等式成立;

(2)假設(shè)n=k(k∈N^*)時不等式成立,即＜k+1,則n=k+1時,

=(k+1)+1,∴當n=k+1時,不等式成立.

上述說法

A.過程全都正確                                B.n=1驗得不正確

C.歸納假設(shè)不正確                              D.從n=k到n=k+1的推理不正確

A.5                               B.大于1小于10的某個整數(shù)

C.10                            D.大于10的某個整數(shù)