XX true XXX XXXX
k≥1XXX show XXXX
P(k+1)XX XXXX
XX.n = 1
27. XXXXXXXXX (X) XXXXX be "XX XXX inductive hypothesis", XXXXXXXXX (2) XXXXX XX "XXX XXXXX XXXX common XXXXXX3."
XX. H2k+1 = XXX + 1/(2^X +X) + 1/(2^X +2) +......+ 1/(X^k +X^k)
XX.XXXXXXXXXXXXX XXX not XXXXXXXXX
30. {x, y, z}
31.Xis a XXXXXXX XXXXXXX andgXX a XXXXXXX XXXXXXX.
XX.XXXXX XX no least XXXXXXX.
33. g
XX. {i, h, e, g}
35. k, X, d, c, a, f, b,i, h, e, g.
36. As an XXXXXXXXXX simple XXXXX.
XX. b.
38. X.
39. X.
40. True
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