用數(shù)學(xué)歸納法證明不等式:1/n+1/n+1+1/n+2+…+1/n2>1(n∈N*且n>1).
用數(shù)學(xué)歸納法證明不等式:
+
+
+…+
>1(n∈N*且n>1).
1 |
n |
1 |
n+1 |
1 |
n+2 |
1 |
n2 |
數(shù)學(xué)人氣:559 ℃時間:2020-06-30 11:01:59
優(yōu)質(zhì)解答
證明:(1)當(dāng)n=2時,左邊=12+13+14=1312>1,∴n=2時成立(2分)(2)假設(shè)當(dāng)n=k(k≥2)時成立,即1k+1k+1+1k+2+…+1k2>1那么當(dāng)n=k+1時,左邊=1k+1+1k+2+1k+3+…+1(k+1)2=1k+1k+1+1k+2+1k+3+…+1k2+2k+1(k+1)2?1...
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