设Sn为数列an的前n项和,Sn=(-1)*nan-1/2*n,n属于N*,则(1)a3=?(2)S1+S2+...+S100=?
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![设Sn为数列an的前n项和,Sn=(-1)*nan-1/2*n,n属于N*,则(1)a3=?(2)S1+S2+...+S100=?](/uploads/image/z/4948589-29-9.jpg?t=%E8%AE%BESn%E4%B8%BA%E6%95%B0%E5%88%97an%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2CSn%3D%28-1%29%2Anan-1%2F2%2An%2Cn%E5%B1%9E%E4%BA%8EN%2A%2C%E5%88%99%281%29a3%3D%3F%282%29S1%2BS2%2B...%2BS100%3D%3F)
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