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A summer homework math problem in junior high school.
( 1+3)( 1+3^2)( 1+3^4)( 1+3^8)( 1-3)/( 1-3)

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

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

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

=( 1-3^8)( 1+3^8)/(-2)

=( 1-3^ 16)/(-2)

=(3^ 16- 1)/2

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