2 1 () 0.25 0.125 () 0.03125 fill in the blanks

2 1 () 0.25 0.125 () 0.03125 fill in the blanks

2 1 （0.5） 0.25 0.125 （0.0625 ） 0.03125
The latter is half of the former

The following is a list of bus fares. Is the ticket price directly proportional to the distance traveled? Why? The distance is 1-20 21-30 31-40 41-50 51-60
Ticket price 10 20 30 40 50

Obviously, it's not. The ticket price is in direct proportion to the distance, which means that the ratio of the distance to the corresponding ticket price is always a fixed positive number. Look at this question, if I take a kilometer, it's 10 yuan, 2 km or 10 yuan, 3 km or 10 yuan. The distance is different, but the ticket price is the same, so the ratio of the distance to the ticket price is not a fixed positive number

Simple calculation: 6 * 57 of 7 and 1 of 6 + 3 * 41 of 4 and 1 of 3 + 4 * 51 of 5 and 1 of 4

6 / 7 × (56 + 1 / 6) + 3 / 4 × (40 + 1 / 3) + 4 / 5 × (50 + 1 / 4)
= 6 × 56 out of 7 + 7 × 6 out of 7 + 3 × 40 out of 4 + 3 × 3 out of 4 + 4 × 50 out of 5 + 4 × 4 out of 5
＝48＋1＋30＋1＋40＋1
＝121

Eighty one Gongge (Sudoku)
Eighty one grid (Sudoku): there are 81 grids, which are divided into nine blocks. Each block is added with 1-9 numbers and can't be repeated. In the 81 grids, there are 1-9 numbers vertically and horizontally. Can you repeat them (Note: 0 means space) does anyone know the algorithm
0 0 0 0 0 0 0 0 0
0 0 0 9 4 0 0 0 7
0 1 6 0 0 8 0 4 9
0 0 9 6 0 4 0 5 0
0 0 0 0 0 0 0 0 0
2 4 0 8 0 0 6 9 0
0 7 0 0 0 0 0 0 0
8 0 1 4 5 6 0 0 3
0 0 4 1 9 0 2 0 0

4 5 2 7 1 9 3 6 8 3 6 5 9 4 2 1 8 7 1 6 3 8 5 4 9 1 3 9 6 7 4 8 5 2 9 2 3 5 8 7 4 1 6 2 4 7 8 3 5 6 9 1 5 7 8 2 6 1 9 3 8 9 1 4 5 6 7 2 3 6 8 4 1 9 3 2 7 5 should be OK. What I checked is I don't know if there is