=(2^2-1)*(2^2+1)*(2^4+1)*...*(2^64+1)
=(2^4-1)(2^2+1)*(2^4+1)*...*(2^64+1)
=(2^8-1)(2^8+1)*...*(2^64+1)
=...
=(2^64-1)(2^64+1)
=2^128-1
mk vua lm ra do!!!!!!
tks bạn nhưng mk làm ra lâu rồi sorry nha
(mặc dù mk vẫn tk cho bạn)
\(=\)\(\left(2^2-1\right)\times\)\(\frac{2^4-1}{2^2-1}\)\(\times\frac{2^8-1}{2^4-1}\)\(\times\)...\(\times\)\(\frac{2^{128}-1}{2^{64}-1}\)
\(=\)\(2^{128}\)\(-1\)