证明:1/1+2+1/1+2+3+···+1/1+2+3+···+n=n-1/n+1
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证明:1/1+2+1/1+2+3+···+1/1+2+3+···+n=n-1/n+1
一定要过程!
是1/(1+2)+1/(1+2+3)+···+1/(1+2+3+···+n)=(n-1)/(n+1)
一定要过程!
是1/(1+2)+1/(1+2+3)+···+1/(1+2+3+···+n)=(n-1)/(n+1)
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