![](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>)
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,
The origin is 0
So the distance = | √ 7-0 | = √ 7
The position of rational number ABC on the number axis (the number axis can not be drawn, negative means on the left side of the origin, positive means on the right side of the origin): - A, - C, B
(1) Simplification: | A-B | + | a + C | - | B-C | + | 2C |;
(2) When a = - 3, C = - 2, find the value of the above formula
Because a and C are negative on the left side of the origin, and B is positive on the right side of the origin, so a-b
RELATED INFORMATIONS
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. What is the ten digit number of 1 + 11 + 111 + 1111. + 11.11 (thirty ones) = s
- 6. How to calculate the weight of 240 copper wire
- 7. The conductor is a. glass plate B. rubber rod C. plastic rod D. copper wire
- 8. 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
- 9. What is the principle of the test button on the leakage protector
- 10. 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
- 11. 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)
- 12. 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)
- 13. If P (Sina, COSA) is a point on the terminal edge of angle a, what is the value of a
- 14. 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
- 15. If for any real number a, f (Sina + COSA) = sinacosa, find f (0) + F (1)?
- 16. The range of y = Sina / (COSA + 2)
- 17. 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
- 18. 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)
- 19. In the triangle AOB, the coordinates of two points AB are (- 4, - 6), (- 6, - 3) respectively, and the area of the triangle can be calculated (hint: the area of the triangle AOB can be seen from
- 20. As shown in the figure, in the triangle AOB, the coordinates of a and B are (- 4, - 6), (- 6, - 3), respectively. Calculate the area of the triangle AOB (hint: the area of the triangle AOB can be regarded as the area of a trapezoid minus the area of some small triangles)