![](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>)
The positions of rational numbers a and B on the number axis are shown in the figure. Now compare the sizes of a, B, C and D. the correct one is () ———┃—————————————┃————┃——————＞ a 0 b A,-a
D
1. Square 2. Rectangle 3. Regular pentagon 4. Regular hexagon
How many can be covered with only one kind of figure
A. 1 species B.2 species C.3 species D.4 species
I hope my answer will help you!
Now we define some kind of operation "*" a * b = 2a-b. if the absolute value of 1 / 2-x * 2 = 4, then x=
[|1-x|/2]*2=4
2[|1-x|/2] -2=4
|1-x|=6
|x-1|=6
X-1 = 6 or X-1 = - 6
X = 7 or x = - 5
RELATED INFORMATIONS
- 1. ABCD, the absolute value of ABCD is divided by ABCD to get negative 1. Find the absolute value of a in a + B in B + C in C + D in D
- 2. Block determinant ABCD = ad BC M = matrix ABCD proves that | m | = | ad-bc | does not give whether AD two are invertible
- 3. A. If B, C and D are four points in order on a straight line, and AC = 10, BD = 8, then the value of AB * CD + BC * ad is equal to____ .
- 4. We define the symbol | a B | C D |, which means | a B | C D | = ad BC We specify the symbol | a B| |c d|, It means | a B| |c d| = ad-bc , For example, 1 2| |3 4| =1*4-2*3=-2 If | x + 1 2x| |2 / 3, 1 / 2 | = 1, Find the value of X
- 5. Given that the real numbers a, B, C and D are not equal to each other, and a + 1b = B + 1C = C + 1D = D + 1A = x, try to find the value of X
- 6. Known x, y, Z are real numbers, if x + y + Z ≠ 0, a = x / x + y, B = Y / Z + X, C = Z / x + y, find the value of a / A + 1, B / B + 1, C / C + 1, please answer in detail!
- 7. a. B are different prime numbers, and 1 / A + B / a = 20 / 91, what are a and B?
- 8. 16 = () + () = () + () prime
- 9. The least common multiple of the three prime numbers is 42. The three prime numbers are (), (), ()
- 10. The least common multiple of the three prime numbers is 42, and the three prime numbers are (), () and (). There is a reward for it
- 11. The point representing an integer on the number axis is called integral point. The unit length of a certain number axis is 1cm. If a line segment AB with length of 2010cm is drawn randomly on the number axis, the integral point covered by the line segment AB is () A. 2009 B. 2010 C. 2010 or 2009 D. 2010 or 2011
- 12. Starting from a point (not a vertex) on an edge of a polygon, connecting each vertex to get 2003 triangles, then the number of sides of the polygon is () A. 2001B. 2005C. 2004D. 2006
- 13. When a ship goes back and forth between a and B, assuming that the speed of the ship in still water does not change, the time it takes for the ship to go back and forth once when the water velocity increases______ (a) no change (b) increase (c) decrease (d) increase or decrease is possible
- 14. Xiao Ming, his father and his mother are playing on the seesaw. Their weight is 150kg. His father is sitting on one end of the seesaw. Xiao Ming, who weighs only half of his mother, is sitting on the other end of the seesaw with his mother. At this time, his father's end is still on the ground. Can you guess what range Xiao Ming's weight should be?
- 15. Xiao Ming, his father and his mother are playing on the seesaw. Their weight is 150kg. His father is sitting on one end of the seesaw. Xiao Ming, who weighs only half of his mother, is sitting on the other end of the seesaw with his mother. At this time, his father's end is still on the ground. Can you guess what range Xiao Ming's weight should be?
- 16. The four numbers a, B, C and D are arranged in two rows and two columns, and a vertical line is added on each side to mark them as ABCD. Adcb = ad BC is defined, The four numbers a, B, C and D are arranged in two rows and two columns, and a vertical line is added on each side to mark them as | a B |, which is defined as | a B | = ad BC, The above notation is called a determinant of order 2 |x+1 x-1| |1-x x + 1 | = 6, then x= By the way, how did you get it
- 17. The following definition is given: char * AA [2] = {"ABCD", "ABCD"} A) The values of AA array elements are "ABCD" and "ABCD"“ B) AA is a pointer variable that points to a one-dimensional array of characters containing two array elements C) The two elements of AA array respectively store the first address of one-dimensional character array with four characters D) The two elements of the AA array store the addresses of the characters' a 'and' a ' God to explain the following ah
- 18. Let a, B, C and d be nonnegative integers, then AC + BD + AD + BC = 1997, then a + B + C + D=______ ．
- 19. For any two integers, a "+" B = a + B-1, a "×" B = axb-1, Find the value of 4 "×" [(6 "+" 8) "+ (3" × "5)]
- 20. Two kinds of operations are defined, i.e. "0" and "0". For any two integers, a, B, a, B = a + B-1, a, B = a * B-1, the I'm not allowed to finish the title : (1) the value of 4 0 [(16 ￣ 8) ￣ (3 ￣ 5)] (2) If x [