Factorization (2x - y) - 4x + 2Y + 1

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• 1. It is known that the circle x2 + Y2 + x-6y + M = 0 and the line x + 2y-3 = 0 intersect at different points P and Q. if op ⊥ OQ (o is the coordinate origin), then M=______ ．
• 2. Solution of inequality X & sup2; - 4 × (absolute value of x) ＜ - 3
• 3. Given that A1 = 1 in sequence an and point (an, an + 1) is on the image of function f (x) = x + 2, the general term formula is obtained
• 4. There is a problem in probability and Statistics: let the density function of random variable X be f (x) = {3 / 8x ^ 2,0
• 5. The quadratic function f (x) satisfies that f (x + 2) = f (- x + 2), f (0) = 3, f (2) = 1. If there is a maximum value of 3 and a minimum value of 1 on [0, M], then the value range of m is () A. （0，+∞）B. [2，+∞）C. （0，2]D. [2，4]
• 6. Define the function in the interval (- L, l), and prove what the sum of odd function and even function is
• 7. How does Geometer's Sketchpad make analytic expressions fractional? The analytical expressions are all in the form of decimals and cannot be converted into fractions And how to calculate the analytical expression of the vertical line in the line segment
• 8. All formulas of physics compulsory 1 and compulsory 2 in senior one should be comprehensive
• 9. 1. A and B measure the length of the same object with two scales. The result measured by a is 6.50dm, and that measured by B is 0.648m A. The graduation value of the scale used by two people is the same. B. The graduation value of the scale used by two people is different. C. one of the two results must be wrong D. A's reading is more accurate than B's 2. When measuring the length of an object with a smaller scale, the measured value is compared with the real value () A. The measured value is greater than the real value B. the measured value is less than the real value C. the measured value is equal to the real value D. it cannot be judged 3. When we ring the ancient bell, we will find that after stopping the impact on the bell, the bell's "lingering sound" does not stop. The main reason is () A. The echo of the bell B. the big clock is still vibrating C. the big clock stops vibrating D. people's hearing is prolonged 4. What's the reason why people can speak? What's the reason why people can hear? 5. When playing guitar, the finger moves back and forth on the string to change the pitch by changing (). This research method uses the () method
• 10. The acceleration of the car is 6m / S2 when the car is in emergency braking on a flat road. If the car has to stop within 2S, what is the maximum speed of the car? If the car has to stop within 1.5s, how much is the acceleration of the car during braking? (1) what are the implied conditions for a car to "stop" in a certain process?
• 11. Triple integral calculation: calculate ∫ ∫ ∫ Ω √ X & # 178; + Y & # 178; + Z & # 178; * DV, where Ω: X & # 178; + Y & # 178; + Z & # 178; ≤ X
• 12. The sum of 987 minus 287 plus 135. Simple calculation method
• 13. Given the function f (x) = | x2-2 |, if f (a) ≥ f (b), and 0 ≤ a ≤ B, then the area bounded by the points (a, b) satisfying the condition is___ ．
• 14. A ^ 2-1 of A-2 divided by (a-1-a + 1 of 2a-1), where a is the root of the equation x ^ 2-x = root 3
• 15. Unequal angles are not opposite to vertex angles Is this proposition true? Give reasons
• 16. Two equal angles are opposite vertex angles. Is that right also: The sum of adjacent complementary angles is 180 degrees, The remaining angles of the two angles are equal, Two complementary angles are also called adjacent complementary angles, also What is the angle formed by the bisector of two adjacent complementary angles?
• 17. If two angles are equal, then they are opposite vertex angles
• 18. Observe the following figures to find the opposite vertex angle (excluding horizontal angle) (1) As shown in figure a, there are & nbsp; & nbsp; pairs of vertex angles in the figure; (2) As shown in Figure B, there are & nbsp; & nbsp; pairs of vertex angles in the figure; (3) As shown in Figure C, there are & nbsp; & nbsp; pairs of vertex angles in the figure; (4) This paper studies the relationship between the number of straight lines and the logarithm of opposite vertex angle in (1) ～ (3). If n straight lines intersect at a point, how many pairs of opposite vertex angle can be formed? (5) If there are 2008 lines intersecting at a point, how many pairs of vertex angles can be formed?
• 19. What is opposite vertex angle
• 20. Observe the difference and look for the right vertex angle, When there are two lines intersecting at a point, there are () pairs of vertex angles. When there are three lines, there are () pairs of vertex angles. When there are four lines, there are () pairs of vertex angles. When there are n lines, there are () pairs of vertex angles