Cut the area of a circle into two sectors according to 2:7. The area of the large sector is 15 square centimeters more than that of the small sector. What is the area of the small sector?

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• 1. A simple harmonic motion with a period of 4S and an amplitude of 2cm is made. From t / 8 to t, the distance of the particle motion is smaller than 7cm. Why How about the journey of one eighth cycle? What do you mean by 6 + (2-2sin45)?
• 2. Put two squares with 5cm sides together to form a rectangle. What's the perimeter and area of the rectangle?
• 3. What is the relationship between radius, linear velocity, angular velocity and period of a circle? And explain who decreases / increases with who increases
• 4. A sector with radius of 15 and center angle of 216 ° is rolled into the side of a cone, and the height and volume of the cone are calculated
• 5. How to get rid of brackets in mathematical algebraic expressions? How to change symbols? For example: - (A5 [power] - 6B) - (7 + 3b)
• 6. Find the circumference of a circle with radius or diameter. Find the area of a circle with radius or diameter
• 7. The function f (x) = x3-x is known to decrease on (0, a) and increase on [a, + ∞). The value of a is obtained. The expert is requested to answer
• 8. If the function f (x) is an odd function defined on R and a decreasing function on the interval (negative infinity, 0), and f (x) = 0, then f (x)
• 9. Given that f (x) = X3 ax is a monotone increasing function on [1, + ∞), then the maximum value of a is______ ．
• 10. Given that a > 0, f (x) = - X3 + ax is a monotone decreasing function in [1, + ∞), then the maximum value of a is () A. 1B. 2C. 3D. 4
• 11. What simple arithmetic does decimal multiplication have
• 12. A circle passes through a (- 2,1), B (5,0) and the center of the circle is on the straight line x-3y-10 = 0 A circle passes through a (- 2,1), B (5,0) and the center of the circle is on the straight line x-3y-10 = 0
• 13. Calculate the following questions with decimals 12m 9cm + 3M 48CM 6km - 4km 8m 2 yuan 54 Fen + 9Yuan 08 Fen
• 14. Let p be the point on the ellipse x ^ 2 / 100 + y ^ 2 / 64 = 1, let F1 and F2 be the two focal points of the ellipse, and if the angle f1pf2 = 60 °, calculate the area of △ pf1f2
• 15. 1. Car a and car B come from both places at the same time. Car a travels 70 kilometers per hour, while car B travels 85 kilometers per hour. When they meet, car B exceeds the midpoint by 60 kilometers. How far is the distance between the two places? 2. The school organizes a spring outing. The first car travels 30 kilometers per hour and starts at 7 am. The second car starts at 1 pm. The speed is 40 kilometers per hour. As a result, the two cars arrive at the same time. How far is it from the school to the scenic spot?
• 16. Indefinite integral DT 1. Why is it equal to - 1 / Sint + C =The second power of 1 / sint =The third power of 1 / 3 * Sint + C
• 17. Some calculation problems of fractions 2 / 9 minus 7 / 6 times 2 / 9 2. Four fifths by seven ninths by five eighties 3. 5 / 7 by 16 / 5 by 21 / 5 Of course, it's multiplication before subtraction
• 18. In the set with the solution of equation x & # 178; - 4x + 4 = 0 and equation x & # 178; - X-2 = 0 as elements___ There are two elements
• 19. If a is rational, then - a must be negative? Why?
• 20. Let's know that one root of the quadratic equation AX2 + BX + C = 0 is 1, Let a root of the quadratic equation AX & # 178; + BX + C = 0 be 1, and a, B satisfy the √ A-2 + √ 2-a-equality B = √ A-2 + √ 2-a-3, find the root of the square of the equation y-c = 0