It is known that the line AB, a (6,0) and point B move on the curve c y = x ^ 2 + 3, and the trajectory equation of point P in AB is obtained

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• 1. Given the binary linear equation 2x + y = 7 (1), the equation is written in the form of Y expressed by the algebraic expression of X (2), and the positive integer solution of the equation is obtained
• 2. If the sum of the distances between a moving point m and two fixed points F1 and F2 in the plane is a constant 2a, then the locus of point m is () a ellipse B circle C no locus D ellipse or line segment or no trace
• 3. What are the formula of factorization? How to calculate the result quickly? This is the concept of the first semester of the second grade of junior high school. Please answer if you know!
• 4. How many days are there from May 4, 2010 to August 1, 2012?
• 5. Interesting math story about 100 words A brief report
• 6. What are the air pollution index levels? When the air pollution index is lower than what, even if the air quality is excellent? What are the air pollution index levels? What about level seven
• 7. It takes 9 seconds from the first floor to the second floor. The number of stairs between each two floors is the same. How long does it take from the first floor to the sixth floor?
• 8. Simple calculation: 0.627 × 13 + 0.52 × 62.7 + 3.5 × 6.27
• 9. A job, originally planned to take 4 hours to complete, in order to pursue the perfect details, now 5 hours to complete, work efficiency than the original 1. A job, originally planned to take 4 hours to complete, in order to pursue the perfect details, now 5 hours to complete, work efficiency than the original reduced by several percent?
• 10. 31.4 divided by 3.14 = how much? The number in divided by 2, to calculate the formula
• 11. Given that X1 and X2 are the two roots of the equation x & # 178; - 4x + 2 = 0, find the value of (x1-x2) &# 178
• 12. As shown in the figure, it is known that the parabola y = 1 / 2x ^ 2 + MX + n (n ≠ 0) intersects the straight line y = x at two points a and B, intersects the Y axis at point C, OA = ob, and AC ‖ X axis As shown in the figure, it is known that the parabola y = 1 / 2x ^ 2 + MX + n (n ≠ 0) intersects with the straight line y = x at two points a and B, intersects with the Y axis at point C, OA = ob, and AC ‖ X axis (1) finds the functional relationship corresponding to the parabola (2) let D and E be two moving points on the line AB different from a and B (point E is above d). De = √ 2, make parallel lines of Y axis respectively through D and E, intersect the parabola and FG, if the abscissa of point D is x, the area of the quadrilateral degf is y, and, Try to find the relationship between Y and X and the value range of X
• 13. Solving 10 mixed fraction operation problems in grade two of junior high school
• 14. Let the linear parameter equation x = 5 + 3T, y = 10-4t, ① solve the rectangular coordinate equation of the straight line, ② change it into the standard form of the parameter equation
• 15. The derivative problem is solved by F (x) = x ^ 3 + 3ax-1, let a = - m ^ 2, when the real number m changes in what range, y = f (x) and y = 3 have only one common point? The first floor is not right at all.
• 16. If the ordinate of the lowest point of the parabola y = (m-1) x2 + 2mx + 2m-1 is zero, then M=______ ．
• 17. How to combine favorite, are, banana, my, fruit (.) into sentences
• 18. Find the slope and inclination of the line passing through each of the following two points （1）C(10,8)、D(4,-4) (2) P (0,0) Q (- 1, radical 3) (3) M (- radical 3, radical 2) n (- radical 2, radical 3)
• 19. What is the greatest common factor of 30 and 20______ The least common multiple is______ The greatest common factor of 21 and 7 is______ The least common multiple is______ ．
• 20. In the triangle ABC, ab = AC, D is the midpoint of AC. BD divides the perimeter of the triangle ABC into two parts, 12cm and 9cm, and calculates the three sides of the triangle ABC There seem to be two answers