The coordinates of the intersection of the parabola y = x & # 178; - 3x-2 and the x-axis, fast,

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• 1. The known set a = {x | - 2
• 2. The known set a = {X / - 4
• 3. The known set a = {X / x ^ 2-4ax + 3A ^ 2
• 4. Given the set a = {x | 2A ≤ x ≤ A & # 178; + 1}, B = = {x | X & # 178; - 3 (a + 1) x + 2 (3a + 1) ≤ 0} a ∈ R, if B contains the range of a for a?
• 5. Let a = {X & # 178; + (2a-3) x-3a = 0}, B = {X & # 178; + (A-3) x + A & # 178; - 3A = 0}, if a ≠ B, a ∩ B ≠ empty set, try to find a ∪ B
• 6. X & # 178; - 4ax + 3A & # 178; = 1-2a Does X have a real number
• 7. Calculate 2A · (x-3a) = (x + 1) (X & # 178; - x + 1) Calculate the following questions - 2 / 3x & # 178; Y (2x-3 / 1xy + Y & # 178;), (3x-2y) & # 178; · (3x + 2Y) & # 178;
• 8. (2a + b) (2a-3b) + 3A (2a + b) and X (x + y) (X-Y) - x (x + y) &; 4a (x + y) - 6x-6y and a (a-b) - AB + B & # 178;
• 9. Given the complete set u = {1,2,3,4,5}, a = {x | x2-5x + M = 0}, B = {x | x2 + NX + 12 = 0}, and (∁ UA) ∪ B = {1,3,4,5}, can you find the value of M + n?
• 10. Let u = {1,2,3,4}, a = {x vertical line X & # 178; - 5x + M = 0} If a is contained in U, find the range of M The answer is m = 4 or M = 6 or m greater than 25 out of 4
• 11. The parabola y = 2x & # 178; - 3x + m has two intersection points with the straight line y = - 3x + 1 If M = - 1, find the length of the line cut by the parabola?
• 12. Set a = {x  2 + 3x + 2 = 0}, B = {x  2 + (M + 1) x + M = 0}. If a is contained in B, find the value of M
• 13. After playing football, two students studied the number of black and white blocks in football. They found that black blocks were Pentagon, white blocks were hexagon, and black and white, white blocks were more. They output 12 black blocks, but the number of white blocks was different. Can you use the equation to help them solve this problem It's tonight~
• 14. At 8:00 a.m., someone took a boat with bamboo and went upstream. At 10:30 a.m., he found a bundle of bamboo falling into the river. He immediately turned around and went downstream to chase it. It took him 30 minutes to catch up with the bamboo pole. When did the bamboo pole fall into the water? 2. A group of infantry is advancing at a constant speed of 5.4 km / h. the correspondent runs from the end of the team to the head of the team and immediately returns to the end of the team. If the correspondent's speed is 21.6 km / h, what is the length of the infantry line?
• 15. Solving two mathematical problems (solving linear equation with one variable) First: Party A and Party B want to jointly contract a project. Party A will complete the project within 30 days and Party B will complete the project within 20 days. The contract stipulates that the project will be completed within 15 days. Otherwise, a fine of 1000 yuan will be imposed for each day. Party A and Party B sign the contract after discussion (1) Under normal circumstances, can party A and Party B renew the contract? Why? (2) at present, 75% of the project is jointly carried out by Party A and Party B. because there is something urgent elsewhere, one person must be transferred. Who is more suitable to be transferred? Why? The second way: there is a home appliance store that increases the selling price of a refrigerator by 40% according to yuan, and then writes "big reward, 20% discount" in the front advertisement. After consumers complain, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the selling price of yuan per refrigerator The second question is like this: a household appliance store will increase the original price of a refrigerator by 40%, and then write "big reward, 20% discount" in the front advertisement. After consumer complaints, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the price of each ice box
• 16. If you answer well, add it again! Use the equation! (it's better to use the equation of one variable once) According to statistics, from October 11, 2008 to February 28, 2009, the total daily average passenger volume of ground bus and rail transit was 16.96 million person times, and the daily average passenger volume of ground bus was 4 times less than that of rail transit by 690000 person times, The average daily passenger volume of ground bus and rail transit, how many million people do you have? The basic price of household electricity in a city is 0.4 yuan per kilowatt hour. If the monthly electricity consumption exceeds a kilowatt hour, 70% of the basic electricity price will be charged (1) A household uses 84 degrees of electricity in May and pays 30.72 yuan in total. How much is a? (2) If the average electricity charge in June is 0.36 yuan per kilowatt hour, how many kilowatt hours does the household share in June and how much electricity charge should be paid?
• 17. It is known that (M & # 178; - 1) x & # 178; - MX + 8 = 0 is a one variable linear equation about X. find the value of formula 199 (M + x) (x-2m) + 22m
• 18. (3x-1)²=4(x+1)²
• 19. 1.x²+4/3x+______ =(x+____ )² 2. Given (A & # 178; + B & # 178;), # 178; - (A & # 178; + B & # 178;) - 6 = 0, then a & # 178; + B & # 178=____ 3. The equations are solved by formula method and collocation method: 2x & # 178; - 3x = 2, 2x-y & # 178; + 6y-11 = 0, x-2y-1 = 0
• 20. Find the maximum value of the following format: (1) y = 2x & # 178; + 8x + 9 (2) y = - 2x & # 178; + 3x + 7