(1/3)^(n-1) - (1/3)^n 化简
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(1/3)^(n-1) - (1/3)^n 化简
(1/3)^(n-1) - (1/3)^n 化简
(1/3)^(n-1) - (1/3)^n 化简
(1/3)^(n-1) - (1/3)^n 化简
=(1/3)^(n-1)(1-1/3)
=(2/3)×(1/3)^(n-1)
=2×(1/3)^n;
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如果本题有什么不明白可以追问,
(1/3)^(n-1) - (1/3)^n
=(1/3)^(n-1) *(1-1/3)
= (1/3)^(n-1)*2/3
=2*(1/3)^n
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
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