化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!
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化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!原
化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!
化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!
化简:1/2!+2/3!+3/4!+4/5!+.+(n-1)/n!
原式=[1/(2-1)!-1/(2!)]+[1/(3-1)!-1/3!]+……+[1/(n-1)!-1/n!] =1/1!-1/2!+1/2!-1/3!+.+1/(n-1)!-1/n!=1-1/n!=(n!-1)/n!
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