Đáp án:
`C<D`
Giải thích các bước giải:
`C = 12 . ( 5^2 + 1 ) . ( 5^4 + 1 ) . ( 5^8 + 1 ) ............ ( 5^32 + 1 )`
`C =1/2 .24 . ( 5^2 + 1 ) . ( 5^4 + 1 ) . ( 5^8 + 1 ) ............ ( 5^32 + 1 )`
`C =1/2 .(5^2-1) . ( 5^2 + 1 ) . ( 5^4 + 1 ) . ( 5^8 + 1 ) ............ ( 5^32 + 1 )`
`C =1/2 .(5^4-1) . ( 5^4 + 1 ) . ( 5^8 + 1 ) ............ ( 5^32 + 1 )`
`....................................................`
`=>C=1/2.(5^32-1).(5^32+1)`
`C=1/2 .(5^64-1)`
`C=(5^64-1)/2 < D`
Vậy `C<D`