高考数学：数学归纳法.pdf

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 n = k + \ 
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(“ + 1) + (+2) + (“+3) + …+ (4+1)2.
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1 2 1
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ab
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1
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6 6 1 9
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2 an-\  \
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= c.
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5 I
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¥ C*n ¥“ N/rH ¥ ¥ C*n ¥
  1=44+2.
2 / 2 T 1
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