Quadratic function in mathematics of grade nine Given the quadratic function y = ax square + BX + C, when x = 0, y = 7. When x = 1, y = 0, when x = - 2, y = 9 Analytic expression of quadratic function of ball I want a more detailed process, thank you

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• 1. The price of a product is reduced by 10% during the promotion period, and then increased by 10% after the promotion. At this time, the price of the product is lower than the original price () A. Unchanged B. reduced C. increased D. unable to judge
• 2. Naughty and Xiaoxiao are on a straight road. They start from a and B which are 200 meters apart at the same time. Naughty walks 50 meters per minute, Xiaoxiao walks 40 meters per minute. How many meters are they apart in two minutes? Please consider the possible different situations from the location and direction of naughty and Xiaoxiao, and then fill in four different answers ① Two minutes later, they may be () meters apart. ② two minutes later, they may be () meters apart. ③ two minutes later, they may be () meters apart. ④ two minutes later, they may be () meters apart
• 3. In an extracurricular practice activity, students need to measure the distance between two pavilions A and B on both sides of an artificial lake in a park. Now, AC = 30m, BC = 70m, ∠ cab = 120 ° are measured. Please calculate the distance between two pavilions A and B
• 4. Mathematics final paper of grade one 8. If the ratio of the two angles is 7 ∶ 3 and the difference is 72 degrees, the relationship between the two angles is () (A) Equality (b) mutual complement (c) complementarity (d) cannot be determined 9. The charging standard of a taxi is: the starting price is 6 yuan (i.e. the driving distance is less than 3 km, you need to pay 6 yuan). After 3 km, you will be charged 1.5 yuan for every additional kilometer (less than 1 km is counted as 1 km). Someone will pay 18 yuan for taking this kind of taxi from place a to place B. if the distance from place a to place B is 1 km, the maximum value is () （A）7 （B）9 （C）10 （D）11 10. Party A and Party B each use a square piece of paper ABCD to fold a 45 ° angle (as shown in the figure), and their methods are as follows: A: fold the paper along the diagonal AC so that point B falls on point D, then ∠ 1 = 45 °; B: fold the paper along am and an so that B and D respectively fall on a point P on the diagonal AC, then ∠ man = 45 °. For the two people's practice, the following judgment is correct () A) Both a and B are right (b) both a and B are wrong (c) both a and B are wrong (d) both a and B are wrong
• 5. If a certain commodity is sold at a discount of 7.5% of the price, it will lose 25 yuan, and if it is sold at a discount of 9% of the price, it will make a profit of 20 yuan. What is the price of the commodity and what is the purchase price?
• 6. Ask people to teach edition seven grade two mathematics page 47-48 answer, thank you
• 7. As shown in the figure, in the parallelogram ABCD, ab = 10, ad = 6, e is the midpoint of AD, take a point F on AB to make △ CBF ∽ CDE, then the length of AF is () A. 8.2B. 6.4C. 5D. 1.8
• 8. 50 calculation problems of linear equation with one variable It's a little harder
• 9. As shown in the figure, in the rectangular coordinate system, let a (3,2) B (4,1) C (m, 0) d (n, n) be the four vertices of the quadrilateral. When the perimeter of the quadrilateral ABCD is the shortest, the value of M, n is the same
• 10. A mathematical problem about merging similar items ① Known polynomial ax's cube + ax's Square - 2x's cube + 2x's square + X + 1 is a quadratic polynomial about X, find the value of a's square + 1 / A's square + a! ② Try to explain that the sum of any three consecutive integers must be a multiple of 3
• 11. If a withdraws 240 yuan and B withdraws 40 yuan, then the deposits of AB and ab are exactly the same. How many yuan did AB and ab deposit?
• 12. The fourth and the third answer to the area of the shadow part of the figure
• 13. Simple calculation: 3 / 4 × 3 / 4 + 1 / 4 × 0.75% - 75%
• 14. How to do the sixth question on page 47 of the fourth grade second volume mathematics book people's Education Press
• 15. There are both chickens and rabbits in the chicken cage. There are 12 counting legs, 4 heads, how many chickens? How many rabbits?
• 16. Who can help me to review unit 1 ~ 3 of Volume 1 (PEP) of primary school mathematics grade 6
• 17. It is known that f (x) = loga 1-mx / X-1 (a > 0, a ≠ 1, m ≠ 1) is an odd function g(x)=f(x)+loga[(x-1)(ax+1)] 1. Find M 2. Find the definition field of function g (x)
• 18. Given that the image of function y = MX + 4m-3 passes through the origin, the value of M is obtained
• 19. If we know that the graph of the first-order function y = MX + 4M-2 passes through the origin, then M is equal to the graph of the first-order function y = MX + 4M-2 It is known that if the graph of a linear function y = MX + 4M-2 passes through the origin, then M is equal to what, and when m = 1 / 3, which quadrants does the image pass through?
• 20. When m_ When y = MX + m-2, the image passes through the origin