1=1 3+5=8 7+9+11=27 13+15+17+19=64 .推出一般式子.为1=13+5=87+9+11=2713+15+17+19=64.推出一般式子.为什么第一个数会是n2-n+1
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![1=1 3+5=8 7+9+11=27 13+15+17+19=64 .推出一般式子.为1=13+5=87+9+11=2713+15+17+19=64.推出一般式子.为什么第一个数会是n2-n+1](/uploads/image/z/213617-65-7.jpg?t=1%3D1+3%2B5%3D8+7%2B9%2B11%3D27+13%2B15%2B17%2B19%3D64+.%E6%8E%A8%E5%87%BA%E4%B8%80%E8%88%AC%E5%BC%8F%E5%AD%90.%E4%B8%BA1%3D13%2B5%3D87%2B9%2B11%3D2713%2B15%2B17%2B19%3D64.%E6%8E%A8%E5%87%BA%E4%B8%80%E8%88%AC%E5%BC%8F%E5%AD%90.%E4%B8%BA%E4%BB%80%E4%B9%88%E7%AC%AC%E4%B8%80%E4%B8%AA%E6%95%B0%E4%BC%9A%E6%98%AFn2-n%2B1)
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