1. A ^ 2-9b ^ 2 + a-3b 2. M ^ 4-4m ^ 3 + 4m ^ 2-9 3.4x ^ 2-5x-6 4. (x + y) + 2 (x + y) - 15 5.2a ^ 2-4ab + 2B ^ 2-A + B-3 2. (x ^ 2 + x) (x ^ 2 + X-5) + 6,

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• 1. In the isosceles triangle ABC, the opposite sides of the angles a, B and C are a, B and C respectively. It is known that a = 3, B and C are the two real roots of the equation x * + MX + 2-1 / 2m = 0 about X. find the circumference of the triangle ABC (* means square, 30 minutes)
• 2. Find a math problem. Use the knowledge of grade three to answer it A "harmony" EMU running on Hainan east ring high-speed railway has 6 sections of first-class and Second-class car phases. There are 496 seats in total, including 64 seats for each first-class car phase and 92 seats for each Second-class car phase?
• 3. In the triangle ABC, ∠ BAC = 90 °, AC = 3, ab = 4, D is a point on the side BC, and ∠ CAD = 30 °, then the length of ad is () A. 65B. 75C. 85D. 95
• 4. Using isosceles trapezoid knowledge to solve mathematics problems in grade three of junior high school It is known that in isosceles ABCD, ad is parallel to BC, diagonal AC is perpendicular to BD, ad = 3cm, BC = 7cm
• 5. There are 330 cattle in three villages. If Zhangzhuang increases 17, Lizhuang increases 25 and Wangzhuang increases 42, then the ratio of cattle in Zhangzhuang and Lizhuang is 3:4, and the ratio of cattle in Lizhuang and Wangzhuang is 7:5_ ∩) O... Ha ha
• 6. Thank you for doing 3Q! 256.269.286.302 { } A305 B307 C310 D369
• 7. The window design of a science and technology building in a middle school is shown in Figure 1. If each symbol (window shape) represents an Arabic numeral, and each horizontal line of three symbols from left to right is regarded as a three digit number, if it is known that the windows on the four floors correspond to four three digits, they are 837571206439, then according to the rule shown in Figure 1, 1992 should be the one in Figure 2______ ．
• 8. A math problem, help me! 3Q Xiao Ming counted the eggs. His mother said, "it's estimated that the number of eggs produced today will not exceed 50." Xiao Ming said, "there's only one egg left for two, four for five, and just three for three." how many eggs are there? The answer to complete, not only to the process and results, but also to the problem-solving method, this kind of answer is most likely to be the best answer Oh! 3Q
• 9. The purchase rule of a commodity is: no more than 100 pieces, according to B yuan per piece; if more than 100 pieces, according to (b-20) yuan per piece. It costs a yuan to purchase no more than 100 pieces now. If 13 pieces are added on this basis, the cost is still a yuan. If the purchase price is set to be whole yuan per piece, then B yuan=______ ．
• 10. RT Question 1 6 / 3-P = P + 3 Question 2 10-2q = 5Q-2 out of 9 Question 3 12 (Y-9) = 6 (Y-5) Question 4 2 (- 9y-15) = - 4 (5Y + 10) Question 5: 3 / 8y-10 = 4 / 7Y + 4 Question 6 22-3y of 2 = y-6 of 5 OK, that's all. Please write down the process and don't just give an answer`` I hope to know Is the first question really - 1 / 4? I think it's like - 0.5 I'm not a kid. I'm my aunt's kid. I won't ask
• 11. Third grade math problem! Help to solve the next When Xiaoqiang was 12 years old, he only had three birthdays. Guess he was born on () month () and his birthday was in () quarter
• 12. Little Red Riding Hood carried a basket of eggs to sell in the city. She sold half and one of all the eggs for the first time, half and one of the remaining eggs for the second time, and half and one of the remaining eggs for the third time. At this time, there was still one egg left in the basket. How many eggs were there in the basket?
• 13. Some math problems, 3Q 1. A rectangular ventilation pipe, 4 meters long, with a cross section of 80 cm square. How many square meters of iron sheet is needed to make 100 such ventilation pipes? 2. There are two cubes whose edges are both 15 cm long. Put them together into a cuboid. The surface area of the cuboid is less than the sum of the original two cubes () 3. The total length of the edges of a cuboid is 80 cm, the length is 10 cm, the width is 7 cm, and the height is () cm
• 14. It is composed of two three digit numbers 0123456789. The sum of these two numbers must be four digits. These 10 numbers must be used completely and cannot be repeated
• 15. I'm in a hurry If f (x) is an odd function with a period of 5, and f (- 3) = 1, Tan @ = 2, then f (x) is an odd function with a period of 5（ 20sin@cos@ ）What is the value of? The monotone decreasing interval of function y = LG [radical 3-2sin (Π / 6 - 2x)] is?
• 16. Mathematical problems of high school function If the function f (x) = (k-1) a ^ x-a ^ (- x) (a > 0 and a ≠ 1) is both odd and even on R, then the image of G (x) = loga (x + k) is A. Monotonically decreasing at (- 2, + ∞) B. Monotonically increasing at (- 2, + ∞) C. Monotonically decreasing at (2, + ∞) D. Monotonically increasing in (2, + ∞) The title must be right!
• 17. Ask a math problem (about high school function), It is known that the function y = f (x) defined on R satisfies f (0) ≠ 0. When x > 0, f (x) > 1, and for any a, B ∈ R, f (a + b) = f (a) f (b) (1) Verification: F (0) = 1; (2) Proof: for any x ∈ R, f (x) > 0; (3) It is proved that f (x) is an increasing function on R
• 18. For any differentiable function f (x) on R, if (x-1) f ′ (x) ≥ 0, then () A. f（0）+f（2）＜2f（1）B. f（0）+f（2）≤2f（1）C. f（0）+f（2）≥2f（1）D. f（0）+f（2）＞2f（1）
• 19. Given the function f (x) = x2 + 2aX + 2, X ∈ [- 5,5] (1) when a = - 1, find the maximum value of the function; (2) find the value range of the real number a, so that y = f (x) is a monotone function in the interval [- 5,5]; (3) find the minimum value of y = f (x)
• 20. 1. If f (x) = x ^ 2 + ax + 3, if x ∈ [- 2,2], f (x) ≥ a, find the range of A 2. For any x ∈ R, we know that f (x) + F (y) = f (x + y), and when x > 0, f (x) + F (y) = f (x + y), f（x）