Fill in the blanks in Senior High School Biology Is there such a book that is full of blank questions about book knowledge

I haven't seen it

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1. It is known that in the trapezoid ABCD, ad ‖ BC, e and F are the midpoint of AB and CD respectively, connecting EF. Please prove the triangle median theorem according to the method
2. What is cosx + 6x, odd or even
3. As shown in the figure, in diamond ABCD, e and F are the points on BC and CD respectively, ∠ B = ∠ EAF = 60 ° and ∠ BAE = 20 ° to find the degree of ∠ CEF
4. In the past, it took 8 hours for the toy factory to produce 1200 dolls. After the technical reform, it took only 6 hours, and the working time was shortened by several percent
5. The circumference of a rectangle is 48 decimeters. If its length and width are increased by 8 decimeters, its area will increase?
6. It takes three minutes for the train to pass the 2400 meter bridge, and one minute for it to pass by the pole at the same speed. The train travels several thousand meters per minute Answer 1: This train travels x kilometers per minute, so the length of the train is x * 1 = X (x+2400)=3*x X = 1200 m / min Answer 2: I know it takes 3 minutes for the train to pass the 2400 meter bridge! Find out the speed of the train That is v = s / T = 2400m / (3 * 60) = 13.333m/s It took one minute to pass by the pole at the same speed That means the speed is the same! Vspeed = 13.333m/s t=60s S=Vt=13.333M/S *60S=799.98m=0.79998km Everybody, that's right If it's the first one, what does that one mean? Please elaborate!
7. As shown in the figure, in trapezoidal ABCD, ad is parallel to BC, e is the midpoint of edge CD, and the extension line of AE and BC intersects at point F to judge the relationship between s △ ABF and s trapezoidal ABCD
8. The charging standards of taxis in a city are as follows: The charging standards of taxis in a city are as follows: Mileage charge RMB 5.00 for 2km and below More than 2 km, 1.80 yuan for every 1 km one way More than 2 km, 1.40 yuan for each additional kilometer Xiaoming's home is about 5 kilometers away from the school. How much does it cost to take a taxi when he comes home from school?
9. If the rectangular wooden frame nailed by four pieces of wood is deformed into the shape of parallelogram ABCD and its area is half of the rectangular area, then the minimum inner angle of the parallelogram is () A. 30B. 45C. 60D. 90
10. For a two digit number, the number on the one digit is 1 times larger than the number on the ten digit number; if the number on the ten digit number is exchanged with the number on the one digit number, the new number is 45 times larger than the original number, then the original two digit number is 1______ ．
11. The two diagonal lines AC and BD of trapezoidal ABCD intersect at O. it is known that the area of triangle ABO and BCO are 10 and 15 respectively. What is the area of trapezoidal ABCD in square centimeter
12. There are 1g, 2G, 4G, 8g and 15g weights. How many weights should be used to weigh 36g items on the balance at a time? Which weights are they?
13. 1. The original price of a garment is 300 yuan, now the price is increased by 20%, and then the price is reduced by 20%. What is the original price? 2. The original price of a garment is 300 yuan, now the price is increased by 20%, 1. The original price of a piece of clothing is 300 yuan, now the price is increased by 20%, and then the price is reduced by 20%. What is the original price? 2. The original price of a piece of clothing is 300 yuan, now the price is increased by 20%, and then the price is reduced by 20%. What is the current price? When answering, mark the question
14. One student finished half of the course at 3m / s, and immediately finished the other half at 5m / s______ m/s．
15. The width of a river is 100 m. The speed of the ship in still water is 5 m / s. The speed of the current is 3 M / s 1. How to cross the river in the shortest time 2. How to cross the river with the shortest displacement Is it perpendicular to the river bank?
16. A's speed is 5 m / s, B's speed is 3 M / s, in the same direction, if a let B for 4 s first, how many seconds does a run to catch up with B?
17. When someone is riding a bicycle, the average speed on the uphill is 3m / s, and the average speed on the downhill is 5m / s
18. When an object moves in a straight line in a period of time, the velocity V1 in the first half of the time is 5 m / s, and the velocity V2 in the second half of the distance is 3 M / s What's the average speed of this object over the whole distance
19. If the speed in the first half of the journey is 5m / s, and the speed in the second half of the journey is 3m / s, the average speed of the whole journey can be calculated In a hurry
20. The width of the river is 300 m, the flow velocity is 3 M / s, and the velocity of the boat in still water is 5 m / s, Q: (1) what is the shortest time to cross the river? Where can I get to the other bank? (2) Where should the bow of a boat cross the river on the shortest voyage? What is the crossing time?