求两道极限题的解 lim(n->无穷)1+2+3+.+(n-1)/n^2lim(n->无穷)1+1/2+1/4+.+1/
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求两道极限题的解
lim(n->无穷)1+2+3+.+(n-1)/n^2
lim(n->无穷)1+1/2+1/4+.+1/2^n
lim(n->无穷)1+2+3+.+(n-1)/n^2
lim(n->无穷)1+1/2+1/4+.+1/2^n
![求两道极限题的解 lim(n->无穷)1+2+3+.+(n-1)/n^2lim(n->无穷)1+1/2+1/4+.+1/](/uploads/image/z/4734170-26-0.jpg?t=%E6%B1%82%E4%B8%A4%E9%81%93%E6%9E%81%E9%99%90%E9%A2%98%E7%9A%84%E8%A7%A3+lim%28n-%3E%E6%97%A0%E7%A9%B7%EF%BC%891%2B2%2B3%2B.%2B%28n-1%29%2Fn%5E2lim%28n-%3E%E6%97%A0%E7%A9%B7%291%2B1%2F2%2B1%2F4%2B.%2B1%2F)
lim[1+2+3+.+(n-1)/n²]
(n→∞)
=lim[(1+n-1)(n-1)/2]/n²
(n→∞)
=½ lim[n(n-1)]/n²
(n→∞)
=½ lim(1-1/n)
(n→∞)
=½ (1-0)
=½
lim[1 + ½ + ¼ + ⅛ + ...+ (½)^n]
(n→∞)
=lim 1×[1 - (½)^n]/(1 - ½)
(n→∞)
=2lim [1 - (½)^n]
(n→∞)
=2lim [1 - 0]
(n→∞)
=2
(n→∞)
=lim[(1+n-1)(n-1)/2]/n²
(n→∞)
=½ lim[n(n-1)]/n²
(n→∞)
=½ lim(1-1/n)
(n→∞)
=½ (1-0)
=½
lim[1 + ½ + ¼ + ⅛ + ...+ (½)^n]
(n→∞)
=lim 1×[1 - (½)^n]/(1 - ½)
(n→∞)
=2lim [1 - (½)^n]
(n→∞)
=2lim [1 - 0]
(n→∞)
=2
求两道极限题的解 lim(n->无穷)1+2+3+.+(n-1)/n^2lim(n->无穷)1+1/2+1/4+.+1/
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