![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
What's the most beautiful number from 0 to 9? Please 3Q No matter from the visual and elegant point of view, layman free!
Number 1 is unique and healthy everywhere
How many combinations can there be if you choose three out of ten numbers 0-9
Orderly, but not composed of three digits, or 0 can be ranked first.
When it is not repeatable:
1. Sequence is not required
Using combination to calculate C (3,10) = 10 * 9 * 8 / 3 * 2 * 1 = 120
2. Order of requirements
Using permutation to calculate a (3,10) = 10 * 9 * 8 = 720
Repeatable is simple: from 0-999, a total of 1000
Number nursery rhyme: what do the ten numbers from 0 to 9 look like?
In 0-9, which characters are axisymmetric
0, 1, 3, 8, just four!
Which are centrosymmetric figures from 0 to 9, a to Z? Which are axisymmetric figures?
Speed up! 11 points
Centrosymmetric figure 018 hiNOS x z axisymmetric figure 138 A B C D E Hino t U V W x y
Fill in the number of symmetry axes of axisymmetric figure
The number of symmetry axes of axisymmetric figure____
Greater than or equal to one
Fill in 10 numbers 0-9 in (), each number is used only once: () + () = () () () ()
Fill in the blanks with 0-9, ten numbers, () + () = (), () - () = (), () * () = (). Ten numbers cannot be repeated
3+6=9
8-7=1
4*5=20
What are the similarities between the concepts of "axisymmetric figure" and "axisymmetric"__________ The difference is__________ .
The same thing is about axisymmetry
The difference is that an axisymmetric figure is an object, and axisymmetry is the relationship between two objects
How to draw a simple geometric figure of the translation figure
I don't know whether you want the theory or the actual operation. If you can't do it, just draw the figure to be translated on another piece of paper, and then draw the figure to the target position. The theoretical method is to make parallel lines through the key points of the figure, translate equidistant, and connect the translated points to form the translated figure
RELATED INFORMATIONS
- 1. If you want to draw a figure after translation, you must know______ And______ ．
- 2. Put the diamond in the square, please use the translation method to design the pattern, and draw it below
- 3. A rectangular vegetable field is 100 meters long and 90 meters wide. How many centimeters should we draw it on a drawing with a scale of 1000 / 1?
- 4. Draw a circle on a 1:400 scale drawing. The actual area of the circle is known to be 80 square meters, and the area on the drawing of the circle is () square centimeters
- 5. By two triangles. Two circles and two straight lines can form what figure
- 6. Three triangles can be obtained by drawing one line segment in a triangle, and how many triangles can be obtained by drawing 10 line segments
- 7. As shown in the figure, a 1-meter radius fan-shaped lawn is built at each corner of the square of triangle, quadrangle and Pentagon In the triangle, quadrilateral, Pentagon square, the radius of 1 meter fan-shaped lawn was built Fig. 1 lawn area is expressed by π Fig. 2 lawn area is expressed by π Fig. 3 lawn area is expressed by π, π = Pai 3.1415926
- 8. As shown in the figure, the area of parallelogram is 20 square centimeters, and the area ratio of triangle a, B and C in the figure is______ The area of the shadow is______ Square centimeter
- 9. Graphic classification: a square, a rectangle, a cylinder, a triangle, a circle, there are several classification methods, how to divide
- 10. Who has taught the eighth grade first volume mathematics midterm paper of the press? Send it
- 11. Is sector an axisymmetric figure?
- 12. There are six points on a circle, how many line segments? How many triangles?
- 13. If the degree ratio of the three internal angles of a triangle is 2:3:4, then it is a acute triangle B obtuse triangle C right triangle D obtuse angle or right triangle
- 14. The perimeter of triangle ABC is 363cm, where AB = 75, BC = 1 / 3, 27
- 15. In the triangle ABC, if the angle a = 60 degrees and BC = 3, then the perimeter of the triangle ABC is?
- 16. In the triangle ABC, there are two points D and E in AB and BC respectively. Take a point P in AC. if the perimeter of the triangle dep is the shortest, how can p be determined?
- 17. If we know that the vector a = (root 3 * cosx, 0), B = (0, SiNx), the square of the function f (x) = (a + b) + root 3 * sin2x, then if the image of the function is translated according to the vector D, The obtained image is centrosymmetric with respect to the origin, and increases monotonically on [0, π / 4]. Find the vector D with the smallest length,
- 18. Let the rank of vector group A1, A2. Am be r, then any r linearly independent vectors in A1, A2,. Am constitute its maximal linearly independent group
- 19. In isosceles △ ABC, ab = AC, AC side midline BD divides the circumference of triangle into 12cm and 18cm, and calculates the waist length and bottom length of isosceles △ ABC
- 20. If the two sides of the triangle are 3cm and 8cm in length, and the perimeter is even, what is the perimeter?