lim[1/1*2+1/2*3+……+1/n(n+1)]=?n→无穷

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lim[1/1*2+1/2*3+……+1/n(n+1)]=?n→无穷

lim[1/1*2+1/2*3+……+1/n(n+1)]=?n→无穷
lim[1/1*2+1/2*3+……+1/n(n+1)]=?n→无穷

lim[1/1*2+1/2*3+……+1/n(n+1)]=?n→无穷
lim[1/1*2+1/2*3+……+1/n(n+1)]
=lim[1-1/2+1/2-1/3+.+1/n-1/(n+1)]
=lim[1-1/(n+1)]
=lim[n/(n+1)]
n→无穷
原式=1