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1/4,-1/3,7/16,-13/25,7/12可以寫成1/4,-3/9.7/16,-13/25,21/36這是可以看出,奇數項都是正的,偶數項都是負的分母是2²;,3²;,4²;,5²;,6²;分子是1*0+1,2*1+1,3*2+1,4*3+1,5*4+1所以通項公式就是an=…
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