Mathematical simplification in evaluation 1 / 2 - [x-3 (x-1)] - 2 (1 / 2-x), where x = 2 No one >^

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• 1. Given the function f (x) = x2-2x, the area of the region formed by the point (x, y) satisfying the condition f (x) + F (y) ≤ 0f (x) − f (y) ≥ 0 is () A. 4πB. 2πC. 3π2D. π
• 2. 99.9-46.3 = (calculated by simple method)
• 3. A cylinder with a surface area of 50 square centimeters has a bottom area of 15 square centimeters. Two such cylinders form a large cylinder. What is the surface area of this large cylinder
• 4. If the square of 2x - ax + B decomposes the factor, we can get (2x-1) (x + 2) to find the value of a and B
• 5. If the point P (x, y) is on the circle (X-2) ^ 2 + y ^ 2 = 3, then the sum of the maximum and minimum value of Y / X is? (seeking process.)
• 6. Solution set of inequality (absolute value of 1 + x) / (absolute value of x-1) ≥ 3 Ask for specific steps The answer is [- 2, - 1) ∪ (1,2]
• 7. After a 1.5-meter-long cylindrical steel is cut into three sections, the surface area increases by 9.6 square decimeters. What is the original volume of this steel?
• 8. After cutting a 4-meter-long cylindrical steel into two equal sections, the surface area increases by 0.28 square decimeter. If each cubic decimeter of steel weighs 7.8 kg, this will be a big problem How many kilos does the root weigh?
• 9. Cut a 1 meter long cylindrical steel with a diameter of 2 decimeters into two sections and increase its surface area by () square decimeters A. 3.14B. 6.28C. 12.56
• 10. How many square decimeters has the surface area increased when a 2.5-meter-long cylindrical steel with a bottom diameter of 2 decimeters is divided into three sections?
• 11. If y = x * sin2x, Dy =?
• 12. 98.1*0.01+5*9.81+0.049*981
• 13. Quasilinear equation of parabola y = 2px ^ 2
• 14. The square of 6 (x + y) - 11 (x + y) (X-Y) + 3 (X-Y) =?
• 15. X - 1 / 4 [2x-3 (x-1)] = 3 / 2 (x-1) ([is bracket)
• 16. Given that the function g (x) = 1 / 3ax ˇ 3 + 2x ˇ 2-2x, the function f (x) is the derivative of the function g (x) When a ∈ (0, + ∞), if there is a negative number m related to a, such that - 4 ≤ f (x) ≤ 4 is constant for any x ∈ [M, 0], the minimum value of M and the corresponding value of a are obtained
• 17. Function f (x) = x ^ 2 + 2x, the range of X ∈ [- 2,1] is? [] is bracket
• 18. Please add addition, subtraction, multiplication, division, parentheses and brackets to make the result equal to one 1 2 3 4=1 1 2 3 4 5=1 1 2 3 4 5 6=1 1 2 3 4 5 6 7=1 1 2 3 4 5 6 7 8=1 (from grade five winter vacation P2)
• 19. The difference between minus one-third and minus one-third plus minus one-and-a-half is the sum
• 20. (one and a half - two and a third + thirteen fourths) * (- 42)