As shown in figure I is the heart of △ ABC, the extension line of AI intersects at point D, the circumscribed circle intersects at point E, (1) is be equal to IE? Why? (2) Ie is the proportion of AE and de

RELATED INFORMATIONS

• 1. Using historical materialism to explain philosophical basis The social responsibility of enterprises is closely related to the development of enterprises. We should put the concept of sustainable growth into the corporate culture and use historical materialism to explain the philosophical basis of this consensus
• 2. Let the joint density of random variables X and y be f (x, y) = (1 / y) * e ^ - (y + X / y), x > 0, Y > 0
• 3. Today is Tuesday. What day is it in 30 days? Make it clear,
• 4. A simple method is used to calculate: 2004 × 20052005-2005 × 20042004
• 5. How to calculate 243 * 15 * 2 with simple method
• 6. The quotient of the reciprocal of 25 divided by 52 is______ ．
• 7. () multiply by 8 / 3 = 8 / 9 divided by () = 3 / 2 minus () = 4 / 5 plus () () multiply by 8 / 3 = 8 / 9 divided by () = 3 / 2 minus () = 4 / 5 plus ()
• 8. It is known that a = a + 2, B = a ^ 2 + A + 5, C = a ^ 2 + 5a-19, where a > 0 (1) try to explain that B-A > 0 Given a = a + 2, B = a ^ 2 + A + 5, C = a ^ 2 + 5a-19, where a > 0 (1) try to explain B-A > 0 (2) judge the size relationship between B and C, and explain the reason
• 9. What is a parallel string? The original problem: known ellipse x squared / 2 + y squared = 1
• 10. In the cube abcd-a1b1c1d1, e is the midpoint of AB and F is the midpoint of Aa1. 1. Prove that e, C, D1 and F are coplanar 2. CE, DF1, Da three lines are common
• 11. The intersection of the first-order function y = X-2 and y = - CX + 3 is in the first quadrant. Find the value of integer C
• 12. Make a square iron sheet with an area of 108 square centimeters into a square box without cover. What is the maximum surface area of the box? The answer in the book is 67.5 square centimeters, but I made 60 square centimeters, A little low, hehe) A great Xia answered me like this (but I can't understand it, I hope the more detailed the better): you can draw along the diagonal of the square, and then there will be four small triangles and four large triangles. Four small triangles can be seen as a small square, and four large triangles can be seen as two small square Therefore, we can set the area of each small square as X 5X＋X＋2X＝108 X＝13.5 So its surface area is: S＝5X＝13.5×5＝67.5
• 13. How to solve this equation
• 14. A cuboid has a volume of 120 cubic centimeters, a bottom area of 12 square centimeters and a bottom perimeter of 14 centimeters. What is the surface area of the cuboid?
• 15. There is a rectangular sheet of iron 40 cm in length and 30 cm in width. Cut out an equal small square at its four corners to make a cuboid uncovered sheet iron box 5 cm in depth (the thickness of welding joint is not included). What is the volume of the box?
• 16. It is known that one root of the equation x-2x + k = 0 about X is 3. Find the value of K and another real root of the equation
• 17. The image c of function f (x) = x ^ 3 + ax ^ 2 + BX is tangent to the X axis at a point different from the origin, and the minimum value of F (x) is - 4. Find the analytic expression and monotone interval of function f (x)
• 18. Given the function f (x) = x Λ 2 - (a + 2) + ainx, where constant a > 0, when a > 2, (1) find the monotone increasing interval of function f (x)
• 19. Take some examples of the constant motion of molecules in life The more the better, the more detailed = = |
• 20. The average length of the top and bottom of a trapezoid is 30 cm and its height is 20 cm. What is the area of the trapezoid?