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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![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!](/uploads/image/z/2584817-17-7.jpg?t=%E6%B1%82%E6%95%B0%E5%88%97%E7%9A%84%E5%92%8C%3A%EF%BC%881%EF%BC%891%2B2X2%2B3X2%26%23178%3B%2B%E2%80%A6%E2%80%A6%E2%80%A6%E2%80%A6%2BnX2%E7%9A%84%EF%BC%88n-1%EF%BC%89%E6%AC%A1%E6%96%B9%EF%BC%882%EF%BC%891%2F2%2B2%2F2%26%23178%3B%2B3%2F2%26%23179%3B%2B%E2%80%A6%E2%80%A6%2Bn%2F%EF%BC%882%E7%9A%84n%E6%AC%A1%E6%96%B9%EF%BC%89+%EF%BC%883%EF%BC%891%E5%8F%881%2F2%2B3%E5%8F%881%2F4%2B5%E5%8F%881%2F8%2B%E2%80%A6%E2%80%A6%2B%EF%BC%882n-1%EF%BC%89%E5%8F%881%2F%EF%BC%882%E7%9A%84n%E6%AC%A1%E6%96%B9%EF%BC%89+%E6%B1%82%E8%AF%A6%E7%BB%86%E6%AD%A5%E9%AA%A4%E5%92%8C%E8%A7%A3%E9%A2%98%E6%80%9D%E8%B7%AF%21)
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!
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!
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!
第一题用错位相减法,然后利用等比数列求和公式计算.
第二题用分组求和法,前面是等差数列,后面是等比数列.
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