(3+1)*(3^2+1)*(3^4+1)*(3^8+1)

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(3+1)*(3^2+1)*(3^4+1)*(3^8+1)(3+1)*(3^2+1)*(3^4+1)*(3^8+1)(3+1)*(3^2+1)*(3^4+1)*(3^8+1)(3+1)*(3^2+1)

(3+1)*(3^2+1)*(3^4+1)*(3^8+1)
(3+1)*(3^2+1)*(3^4+1)*(3^8+1)

(3+1)*(3^2+1)*(3^4+1)*(3^8+1)
(3+1)*(3^2+1)*(3^4+1)*(3^8+1)
=[(3-1)*(3+1)*(3^2+1)*(3^4+1)*(3^8+1)]/(3-1)
=[(3^2-1)*(3^2+1)*(3^4+1)*(3^8+1)]/(3-1)
……………………………………………………
=(3^16-1)/2

是不是还要往后乘呀

=4*10*82*6562=21523360

=(3^16-1)/(3-1)
是平方差公式的应用。
(3-1)*(3+1)*(3^2+1) * (3^4+1) * (3^8+1)=3^16-1.

(3+1)*(3^2+1)*(3^4+1)*(3^8+1)
=(3-1)(3+1)*(3^2+1)*(3^4+1)*(3^8+1)/(3-1)
=(3^16-1)/2
=21523360

(3+1)*(3^2+1)*(3^4+1)*(3^8+1)
=2/2*(3+1)*(3^2+1)*(3^4+1)*(3^8+1)
=(3-1)*(3+1)*(3^2+1)*(3^4+1)*(3^8+1)/2
=(3^2-1)*(3^2+1)*(3^4+1)*(3^8+1)/2
=(3^4-1)*(3^4+1)*(3^8+1)/2
=(3^8-1)*(3^8+1)/2
=(3^16-1)/2

原式=(3-1)(3+1)(3^2+1)(3^4+1)(3^8+1)/2
=(3^2-1)(3^2+1)(3^4+1)(3^8+1)/2
=(3^4-1)(3^4+1)(3^8+1)/2
=(3^8-1)(3^8+1)/2
=(3^16-1)/2
可以吗?