1.

image.png
2.
十進制轉(zhuǎn)二進制:
eg:19
19÷2=9......1
9÷2=4......1
4÷2=2......0
2÷2=1......0
1÷2=0......1
從下往上讀余得
10011
十進制轉(zhuǎn)二進制:
eg:11011
1 2 4 8 16
1 1 0 1 1
1+2+0+8+16=27

image.png
3.

image.png
4.

image.png
eg:19
19÷2=9......1
9÷2=4......1
4÷2=2......0
2÷2=1......0
1÷2=0......1
從下往上讀余得
eg:11011
1 2 4 8 16
1 1 0 1 1
1+2+0+8+16=27