摘要:观察下列各式: (x2-1)÷(x-1)=x+1 (x3-1)÷(x-1)= x2+x+1 (x4-1)÷(x-1)= x3+ x2+x+1 (x5-1)÷(x-1)= x4+ x3+ x2+x+1 -- (1)根据上面各式的规律.你能得(xn-1)÷(x-1)的结果吗? (2)根据这一结果计算:1+2+22+23+-+262+263

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