The greatest common factor of the two numbers is fifteen. How many are the common factors of the two numbers With several 6 cm long and 4 cm wide rectangles, you can make a square with a length of () cm

1. Is the title right?
2、12

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1. A question to fill in the blanks in the second volume of the sixth grade of Mathematics In order to reflect the relationship between the number of sixth grade students weighing more than 40 kg and the total number of students, it is more appropriate to choose () statistical chart: to reflect the height of five students, such as Xiao Ming and Xiao Hong, when they were 10 years old, it is more appropriate to choose () statistical chart
2. Simple arithmetic problem of primary school mathematics 620 × 37 △ (904-594) Can we multiply first and divide later
3. Sixth grade volume I mathematics out of form calculation (not simple calculation) 100
4. ① Divide 175 into the sum of four numbers, and then fill them in the following equation to make the formula true （）+4=（）-4=（）×4=（）÷4 ② Select the symbols "+ - × ^" and "()" to make the following formulas true 2 2 2 2 2=8 2 2 2 2 2=7 2 2 2 2 2=6 2 2 2 2 2=4 2 2 2 2 2=3 2 2 2 2 2=1 complete
5. Do you need to write answers after the second grade math problem?
6. (1 + radical 2) x ^ 2 - (1-radical 2) x = 0 9(2X-1)^2 - 4(2X+3)^2 =0 3X^2 +10X+4=0
7. How to get 32 by calculating four four with + - x
8. Who can work out this problem Leo Tolstoy, the great master of Russian literature in the 19th century, once wrote such a story in his work "does one need a lot of land?" There was a man named bahome who went to the grassland to buy land. The chief who sold the land offered a very strange price of "1000 rubles per day", which means that as long as he started from the specified place at sunrise and returned to the starting point before sunset, all the land enclosed by the route he took would belong to him. If he could not return to the starting point before sunset, he would not get any land, It costs 1000 roubles Bahome felt that this condition was good for him, so he paid 1000 rubles. The next day, at dawn, he quickly strode forward on the grassland. He walked a full 10 Russian miles (1 Russian mile ≈ 1.0668 km) before turning left. Then he walked a long time before turning left again. After walking another 2 Russian miles, he found that it was not early, and he was still 15 Russian miles away from the starting point, So I had to change direction and run straight to the starting point Finally, he arrived at the starting point on time, but died of overwork and spitting blood How many Russian roads did bahome walk on this day? What is the area of land surrounded by his route
9. As for some concepts of mathematics, I have finished the third year of junior high school When we ask the question "when a value is, another conclusion is true", for example, "when the value of AM is, the quadrilateral amdn is a rectangle". I should take this value (for example: am = n) as a known condition to prove it, What about DN? If it's a square, or a square, it's a square
10. Several mathematical concept problems 1. The solution of the equation: make the value of the unknown number of equation () the solution of the equation 2. Merge similar terms: use the () rule to change the equation into () form 3. The coefficient is changed to 1: according to () of the equation, divide () of the unknown number on both sides of the equation to get the solution of the equation Please,
11. Cut a cylinder into the largest cone. The volume of the cylinder is 18.84 cubic centimeter. The volume of the cylinder is () cubic centimeter A. 18.84B. 9.42C. 28.26D. 37.68
12. The length of two right angles of a right triangle is 3cm and 5cm respectively. If the two right angles are rotated for one circle, the volume difference between them is () CM & sup3 ..
13. The knowledge points of mathematics "formula and equation" in Volume 2 of grade 6
14. A cylinder, 14dm, unfolds its side to form a square. What's the volume of the cylinder? (the number obtained is kept to one decimal place) I'll give it to the teacher tomorrow~
15. If the volume ratio of a cylinder to a cone is 2:3 and the radius ratio of its bottom is 1:2, then the ratio of its height is 2:3______ ．
16. Fill in the blanks about cylinder and cone (1) The upper and lower sides of the cylinder are () shape, and the area is (). The side view of the cylinder is () shape, one set of opposite sides of the figure is cylindrical (), the other set of opposite sides is cylindrical () (2) Expand the side of a cylinder to get a square. The diameter of the bottom of the cylinder is 8cm, and the height of the cylinder is () cm (3) The bottom of the cone is a () shape. The distance from the top of the cone to the center of the circle is called () of the cone (4) If the base area and height of a cylinder and a cone are equal respectively, then the volume of the cone is () of the volume of the cylinder (5) The bottom area of a cone is 12 square decimeters, its height is 9 decimeters, and its volume is () cubic decimeters (6) The volume of a cylinder is 21 cubic centimeters, and the volume of a cone is () cubic decimeters
17. How to judge whether to calculate the surface area or the volume or the sum of edge length in all the application problems of cuboid?
18. On cuboid and cube volume and surface area of the application of the more the better
19. For a 10 cm high steel cylinder, the surface area will be reduced by 18.84 square centimeters if the 2 cm high steel cylinder is cut first Fast, fast, fast, fast
20. Use letters to represent all formulas of cone and cylinder!