Bài đã đăng bạn hạn chế đăng lại nhé.
1:
A=(3^2-1)(3^2+1)*...*(3^16+1)
=(3^4-1)(3^4+1)(3^8+1)(3^16+1)
=(3^8-1)(3^8+1)(3^16+1)
=(3^16-1)(3^16+1)
=3^32-1
2: B=-(3-1)(3+1)*...*(3^16+1)
=-(3^2-1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)
=-(3^4-1)(3^4+1)(3^8+1)(3^16+1)
=-(3^8-1)(3^8+1)(3^16+1)
=-(3^16-1)(3^16+1)
=-(3^32-1)
3:
C=(5^2-1)(5^2+1)*...*(5^16+1)
=(5^4-1)(5^4+1)(5^8+1)(5^16+1)
=(5^8-1)(5^8+1)(5^16+1)
=(5^16-1)(5^16+1)
=5^32-1
4:
D=(4^2-1)(4^2+1)*...*(4^64+1)
=(4^4-1)(4^4+1)*...*(4^64+1)
=(4^8-1)(4^8+1)*...*(4^64+1)
=(4^16-1)(4^16+1)(4^32+1)(4^64+1)
=(4^32-1)(4^32+1)(4^64+1)
=(4^64-1)(4^64+1)
=4^128-1
5:
E=(5^2-1)(5^2+1)*...*(5^128+1)
=(5^4-1)(5^4+1)*...*(5^128+1)
=(5^8-1)(5^8+1)*...*(5^128+1)
...
=5^256-1
