括号1*3*9+2*6*18+,.+n*3n*9n分之1 *2*4+2*4*8+,+n*2n*4n括号完了的平方
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![括号1*3*9+2*6*18+,.+n*3n*9n分之1 *2*4+2*4*8+,+n*2n*4n括号完了的平方](/uploads/image/z/1088288-8-8.jpg?t=%E6%8B%AC%E5%8F%B71%2A3%2A9%2B2%2A6%2A18%2B%2C.%2Bn%2A3n%2A9n%E5%88%86%E4%B9%8B1+%2A2%2A4%2B2%2A4%2A8%2B%2C%2Bn%2A2n%2A4n%E6%8B%AC%E5%8F%B7%E5%AE%8C%E4%BA%86%E7%9A%84%E5%B9%B3%E6%96%B9)
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括号1*3*9+2*6*18+,.+n*3n*9n分之1 *2*4+2*4*8+,+n*2n*4n括号完了的平方
括号1*3*9+2*6*18+,.+n*3n*9n分之1 *2*4+2*4*8+,+n*2n*4n括号完了的平方
括号1*3*9+2*6*18+,.+n*3n*9n分之1 *2*4+2*4*8+,+n*2n*4n括号完了的平方
括号1*3*9+2*6*18+,.+n*3n*9n分之1 *2*4+2*4*8+,+n*2n*4n括号完了的平方
=[8(1+8+.+n^3)/27(1+8+.+n^3)]^2
=(8/27)^2
=64/729