十进制转二进制 题目帮忙解答 不是很烦的数字

(1)100101
(2)1111111
(3)1000001
(4)110110

(1)101001.111
（37/2=18......1，
18/2=9.........0，
9/2=4..........1
4/2=2..........0
2/2=1..........0
1/2=0..........1

0.875x(乘）2=0.75......1
0.75x2=0.5.............1
0.5x2=0................1)

(2)1111111.01
(127/2=63..............1
63/2=31................1
31/2=15................1
15/2=7.................1
7/2=3..................1
3/2=1..................1
1/2=0..................1

0.25x2=0.5.............1
0.5x2=1................0

(3)1000001.001
(65/2=32...............1
32/2=16................0
16/2=8.................0
8/2=4..................0
4/2=2..................0
2/2=1..................0
1/2=0..................1

0.125x2=0.25...........0
0.25x2=0.5.............0
0.5x2=0................1

(4)约为110110.0011