(1*2*4+2*4*8...+n*2n*4n/1*3*9+2*6*18+n*3n*9n)的平方*为乘号/为除号
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(1*2*4+2*4*8...+n*2n*4n/1*3*9+2*6*18+n*3n*9n)的平方*为乘号/为除号
(1*2*4+2*4*8...+n*2n*4n/1*3*9+2*6*18+n*3n*9n)的平方
*为乘号/为除号
(1*2*4+2*4*8...+n*2n*4n/1*3*9+2*6*18+n*3n*9n)的平方*为乘号/为除号
= (8(1*1*1+2*2*2+...+n*n*n) / 27(1*1*1+2*2*2+...+n*n*n))^2
= (8/27)^2
= 64/729