What is the third grade of primary school

It is calculated step by step. A question will have many numbers and many different symbols, such as 78 × (45 + 12) △ 3

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1. Find the equation of the circle whose center C is on the straight line x + 2Y + 4 = 0 and passes through two points a (- 1,1), B (1, - 1)
2. (1) 14700-14700 △ 28 + 825; & nbsp; & nbsp; & nbsp; & nbsp; (2) (3400 + 2856 △ 84) △ 34
3. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
4. Given the image of quadratic function y = AX2 + BX + C, we try to explain the symmetry axis of this function image when x = 2 through a (0, a) B (1, - 2A) It is known that the image of quadratic function y = AX2 + BX + C passes through a (0, a) B (1, - 2A) (1) Try to explain the symmetry axis of this function image when x = 2; (2) Based on the available information, can you find the analytic expression of quadratic function in the title? (1) Ask already know
5. Third grade math problem with 24 side length is 1 cm small square put together into a rectangle, this rectangle circumference is how many centimeters?
6. How to find the instantaneous velocity of the first point How to find the instantaneous speed of the first point in a certain period after the learning clock in grade one of senior high school?
7. As shown in the figure, the radius of the fan-shaped paper is 15cm, the center angle is 120 ° and it is used to make the side of a cone model. Calculate the height and side area of the cone (regardless of the loss at the joint, the result retains the root sign)
8. Practical problems and test questions of linear equation with one variable
9. The circumference of a semicircle is 15.42 meters, and its radius is______ Rice
10. A regular n prism has 18 edges. One side edge is 10cm long and the other side is 5C long. What is the side area of this edge?
11. Hyperbola 16x ^ 2-9y ^ 2 = 144, the left and right focal points are F1F2 respectively, the point P is on the hyperbola and ∠ f1pf2 = 60 ° to calculate the area of △ f1pf2
12. Primary school fifth grade mathematics exercise book (1) 45 answers
13. How to calculate the area of parabola and straight line with definite integral The parabola y = the square of X and the straight line y = 2x form the figure and area from 0 to 2
14. What is the formula of standard deviation, covariance and correlation coefficient
15. When we ask the value of M, the equation x & # 178; - 2mx + 2m + 3 = 0 has two negative numbers
16. The difference of negative power with or without brackets
17. Given the solution of the quadratic equation AX ^ 2 + BX + C = 0 about x? You have already answered the answer to this question, but can you tell us the detailed process, thank you. We know that the two univariate quadratic equations ax ^ 2 + BX + C = 0 about X are α and β, and the two equations x ^ 2 + (α + 1) x + β ^ 2 = 0 and x ^ 2 + (β + 1) x + α ^ 2 = 0 about X have a unique common root, so we can find the relationship of a, B and C The answer might be - B / a = - 2 / 5, C / a = - 3 / 25
18. Why is 1 divided by 10 equal to 0
19. It is known that in the hyperbola X & # 178 / 9-y & # 178 / 16 = 1, a and B are the left and right vertices of the hyperbola, and the line L passing through point a is perpendicular to the X axis, Next: find the trajectory equation of the right vertex of the hyperbola and the point with the same distance from the straight line L For the benefit of both sides, the copy has been proofread,
20. Do you want to write the multiplication formula of the whole ten times one digit? () × () = () × () = () x () = 120