## 電腦的語言：十六進制

 A B C D E F 10 11 12 13 14 15

$7\times 16^2+13\times 16^1+15=2015$

 $$0_{16}$$ $$0000_2$$ $$8_{16}$$ $$1000_2$$ $$1_{16}$$ $$0001_2$$ $$9_{16}$$ $$1001_2$$ $$2_{16}$$ $$0010_2$$ $$A_{16}$$ $$1010_2$$ $$3_{16}$$ $$0011_2$$ $$B_{16}$$ $$1011_2$$ $$4_{16}$$ $$0100_2$$ $$C_{16}$$ $$1100_2$$ $$5_{16}$$ $$0101_2$$ $$D_{16}$$ $$1101_2$$ $$6_{16}$$ $$0110_2$$ $$E_{16}$$ $$1110_2$$ $$7_{16}$$ $$0111_2$$ $$F_{16}$$ $$1111_2$$

$7_{16}=0111_2, D_{16}=1101_2, F_{16}=1111_2$

$7DF_{16}=0111 \ 1101 \ 1111_2=11111011111_2$

$0101 \ 1101 \ 1001 \ 0110$

$5D92_{16}$