Fill in the blanks In the line segment between two parallel lines, () the line segment of two parallel lines is the shortest; the length of these two line segments is called the distance between parallel lines

Perpendicular to

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1. It is known that a two digit ten digit number is one less than a single digit number. If the ten digit number is exchanged with a single digit number, the product of the new two digit number and the original formula is 405 more than the square of the original number, and the original number is——————
2. ① Xiao Li collected 68 pieces of banknotes totaling 203 yuan, and donated them to Yushu disaster area. Except for 6 pieces of 5 jiao and 8 pieces of 1 yuan banknotes, the rest are 2 yuan and 5 yuan banknotes. There are () 2 yuan banknotes and () 5 yuan banknotes ② A ship sails downstream from wharf a for 100 minutes to wharf B, and then sails upstream for 2 hours to return to the wharf. The known water velocity is 3 km / h, then the distance between wharf A and wharf B is () km, and the ship's velocity in still water is () km / H ③ A clothing factory wants to produce a batch of certain type of student clothes. It is known that some kind of cloth less than 3 meters long can be made into two coats or three pairs of trousers. One coat and one pair of trousers are a set. It plans to use this kind of cloth 600 meters long to produce student clothes. How many pieces of cloth should be used to produce coats and trousers to match each other? How many sets can be produced? (solution to equation)
3. A store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, which can sell 200 pieces per day. Now it adopts the method of raising the selling price and reducing the purchase quantity to increase the profit. It is known that the daily sales volume of this commodity will decrease 10 pieces per day when the price increases by 0.5 yuan. If the commodity is to make a profit of 640 yuan per day, how much should the selling price be?
4. People's education press seventh grade first volume mathematics midterm paper What I want is exercise
5. As shown in the figure, in the parallelogram ABCD, e is a point on AB, f is a point on CD, and ∠ ade = ∠ CBF, is bfde also a parallelogram?
6. Xiao Li goes from place a to place B by bike, and Xiao Ming goes from place B to place a by bike. They both go at a constant speed. It is known that they set out at 8 am at the same time. By 10 am, they are 36 km apart. By 12 noon, they are 36 km apart. The distance between a and B is calculated
7. It is known that the four vertices of the quadrilateral ABCD are a (4,5), B (1,1), C (5,3) d, (8,7). The line L passes through P (- 1, - 2) and bisects the area of the quadrilateral ABCD,
8. A math problem of merging similar items! 2（a2b+ab2）-2（a2b-1）-2ab2-2 Requirement: write down the process and the result (the number without a sign after the letter is the square)
9. The circumference of diamond ABCD is 32 cm, AE ⊥ BC is equal to, be = CE, and the length of AC is calculated
10. There are some children in the kindergarten. Mr. Wang gave them 64 pieces of sugar and just finished it. The number of children may be large
11. During the promotion period of a shopping mall, it is stipulated that all goods in the shopping mall are sold according to 80% of the price. When customers spend a certain amount of money in the shopping mall, they can get the corresponding amount of lottery tickets according to the following scheme. (lottery shopping no longer enjoys preferential treatment) the price is x (yuan) 100 ≤ x < 200200 ≤ x < 400400 ≤ x < 600 The amount of lottery ticket (yuan) 50100150 If the price of the goods Mr. Hu bought in the shopping mall is 450 yuan, what is the discount______ Yuan
12. Lay 14cm square floor tiles in a room with an area of 12 m2. How many such tiles are needed
13. In a room with an area of 12 m2, lay a square floor tile with a side length of 14 cm. How many such tiles do you need at least? Why do you do this?
14. The area of Xiaowen's room is 10.8m2. The floor of the room happens to be paved with 120 identical square tiles. What is the side length of each tile?
15. The area of Xiaowen's room is 10.8m2. The floor of the room happens to be paved with 120 identical square tiles. What is the side length of each tile?
16. To replace the floor tiles for the room, we used to use square tiles with a side length of 15 cm, a total of 1000 pieces. Now we need to replace them with large square tiles with a side length of 25 cm, which needs to be replaced How many such tiles?
17. Xiaofang bought a new house, ready to lay tiles, his house is 85 square meters, tiles are 30 cm square, how many tiles do you need at least? What is the area of a piece?
18. Xiaohua's room is 5.1 meters long and 3 meters wide. How many pieces do you need if you use 30 cm square tiles?
19. The side length of large tiles is 4 decimeters, and that of small tiles is 3 decimeters. The floor of a room is paved with large tiles, with 6 rows of 24 tiles in each row, How much will it cost
20. To pave a room with a length of 9 meters and a width of 6 meters, how many decimeter square floor tiles are suitable? How many pieces are needed?