32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (16 times of 2 + 1) 32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) (16 times of 2 + 1)

32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (16 times of 2 + 1) 32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) (16 times of 2 + 1)

(2-1)（2+1）（2^2+1）（2^4+1）（2^8+1）（2^16+1）
=(2^2-1））（2^2+1）（2^4+1）（2^8+1）（2^16+1）
=（2^4-1）（2^4+1）（2^8+1）（2^16+1）
=...
=（2 ^16-1）（2^16+1）
=2^32-1
32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) (16 times of 2 + 1)
=(2^32-1)/(2^32-1)=1

(2 + 1) (quadratic of 2 + 1) (quartic of 2 + 1) (8th of 2 + 1) - 16th of 2
How much?

(2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) - 16 times of 2 = (2-1) (2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) - 16 times of 2 = (2 times of 2-1) (2 times of 2 + 1) (2 times of 4 + 1) (2 times of 8 + 1) - 16 times of 2 = (2 times of 4-1) (2 times of 4 + 1) (2 times of 8 + 1) - 16 times of 2 = (2 times of 8-1) (2 times of 8

5 / 16 times 12 / 25 equals

5/16×12/25=3/20
5 / 16 times 12 / 25 is 3 / 20