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The following statements are correct: (1) 0 is the number with the smallest absolute value; (2) the number whose absolute value is equal to itself is a positive number; (3) the numbers on both sides of the origin on the number axis are opposite to each other; (4) the absolute value is larger but smaller when compared with the two numbers A. 1 B. 2 C. 3 d. 4
① The absolute value of any number is non negative, so the minimum absolute value is 0, so ① is correct; ② the number whose absolute value is equal to itself has 0, so ② is incorrect; ③ the numbers on both sides of the origin on the number axis are opposite to each other only when the distance to the origin is equal, so ③ is incorrect; ④ when comparing two negative numbers, the absolute value is larger, but smaller, so ④ is incorrect; ④ is positive There is only one, so choose: a
As shown in the figure, on the number axis, point a (representing integer a) is on the left side of the origin, and point B (representing integer b) is on the right side of the origin. If | A-B | = 3, and AO = 2BO, then the value of a + B is______ ．
As shown in the figure below, given that the numbers corresponding to the four points of ABCD on the number axis are ABCD respectively, and C + 3D = 19, then where is 0 (answer ABC or D)? On the number axis
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The rational numbers represented by a, B, C and D on the number axis are 1, 3, - 5 and - 8 respectively. (1) calculate the distance between the following points: ① two points a and B, ② two points B and C, ③ two points c and D. (2) if the rational numbers represented by two points m and N are m and N respectively, calculate the distance between two points m and n
(1) (2) if M > N, the distance between M and N is M-N; if M < n, the distance between M and N is N-M; to sum up, the distance between M and N is | M-N |
RELATED INFORMATIONS
- 1. The positions of a, B and C on the number axis are shown in the figure below, which is simplified as follows: 1. |a + B | + |b-c | - A + C | 2. |2a-b | + |a-3c | - B + 3C| ———————|———|—|————|———————→ c a 0 b
- 2. It is known that: as shown in the figure, the real numbers corresponding to points a, B, C and D are all integers. If point a corresponds to real number a, point B corresponds to real number B, and b-2a = 7, then the origin on the number axis should be______ Point
- 3. What is the ten digit number of 1 + 11 + 111 + 1111. + 11.11 (thirty ones) = s
- 4. How to calculate the weight of 240 copper wire
- 5. The conductor is a. glass plate B. rubber rod C. plastic rod D. copper wire
- 6. A copper wire with a cross-sectional area of 100 square millimeter weighs more than 1 meter The specific gravity of copper is 8.92 g / cm3. How heavy should a meter of wire be? Summer solstice is coming, man, I'm the same as you, but I'm wrong. What's the matter? The actual weight is much more than the theoretical weight
- 7. What is the principle of the test button on the leakage protector
- 8. Energy meters are used to measure energy______ A meter marked with "220V & nbsp; 5A" can be used for the meter with maximum power of 0______ Watt on the lighting circuit
- 9. The words "2500r / kWh" are marked on the household electric energy meter. If an indoor electric appliance works alone for 30 minutes and the turntable rotates for 50 turns, the consumption of the electric appliance is less than 50% If the power of the appliance is Watt, the working hour of the appliance consumes 1 kwh I hope brothers and sisters can give the calculation process
- 10. There is 3000r / kW. H on the dial of an electric energy meter. Use the electric energy meter and stopwatch to calculate the electric power of an electric lamp and let the lamp work independently, It takes three minutes to find out: (1) what is the electric energy consumed by the lamp? (2) the electric power of the lamp
- 11. The corresponding points of rational number ABC on the number axis are a, B and C, and their positions are shown in the figure below b
- 12. On the number axis, the distance from the point of √ 7 to the origin is equal to________ . Chapter 2 real numbers I'm going to use it tonight,
- 13. The common equation of C is xsina ycosa Sina = 0, which makes a vertical line of C through the origin. Why is the vertical foot (Sina ^ 2, - cosasina)
- 14. It is known that f (x) = log2 (xcosa + Sina), a belongs to (π / 2,3 π / 4) 1.f（cosA/[1+sinA])=0 2. When x belongs to [- 1,1], f (x) is always greater than or equal to - 1, and the value range of sin (a + [π / 4]) can be obtained 3) If f (1-4sina)
- 15. If P (Sina, COSA) is a point on the terminal edge of angle a, what is the value of a
- 16. In polar coordinate system, the equation of line L is ρ sin θ = 3, then the distance from point (2, π 6) to line L is () A. 4B. 3C. 2D. 1
- 17. If for any real number a, f (Sina + COSA) = sinacosa, find f (0) + F (1)?
- 18. The range of y = Sina / (COSA + 2)
- 19. The vertex o (0,0), a (2,1), B (10,1) of triangle OBC, the line CD is perpendicular to the X axis and bisects the area of triangle ABC. If D (x, 0), then the value of X is
- 20. It is known that the polar coordinates of the two ends of the line segment passing through the pole are P1 (ρ 1, θ 1) P (ρ 2, θ 2 + π), and the midpoint m of p1p2 is proved（ It is known that the polar coordinates of the two ends of the line segment passing through the pole are P1 (ρ 1, θ 1) P (ρ 2, θ 2 + π). It is proved that the midpoint of p1p2 is m (ρ 1 - ρ 2, θ 1)