求数列的和:(1)1+2X2+3X2²+…………+nX2的(n-1)次方(2)1/2+2/2²+3/2³+……+n/(2的n次方) (3)1又1/2+3又1/4+5又1/8+……+(2n-1)又1/(2的n次方) 求详细步骤和解题思路!
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