裂相相消问题 3²-1/1 + 5²-1/1 + 7²-1/1+ .+ (2n+1)²-1/1 +.
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裂相相消问题 3²-1/1 + 5²-1/1 + 7²-1/1+ .+ (2n+1)²-1/1 +.
裂相相消问题 3²-1/1 + 5²-1/1 + 7²-1/1+ .+ (2n+1)²-1/1 +.
裂相相消问题 3²-1/1 + 5²-1/1 + 7²-1/1+ .+ (2n+1)²-1/1 +.
3²-1/1 + 5²-1/1 + 7²-1/1+ .+ (2n+1)²-1/1 +.
=(3+1)(3-1)/1+(5+1)(5-1)/1+.+(2n+2)(2n)/1+.
=2*4/1+4*6/1+6*8/1.+(2n+2)(2n)/1+.
=2/1*(2/1-4/1+4/1-6/1+.+2n/1-(2n+2)/1)+.
=2/1*2/1
=4/1
=4/1