As shown in the figure, in the parallelogram ABCD, e and F are the points on AB and CD respectively, and AE = CF, connect BF and De, and try to guess the size relationship between ∠ ade and ∠ CBF prove

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• 1. If the median line of the trapezoid divides the area of the trapezoid into two parts of 1:2, find the ratio of the top and bottom of the trapezoid
• 2. What is the purpose of making lever level balanced before the experiment of "exploring lever balance conditions" in junior high school physics experiment?
• 3. Distribution areas of 11 climate types I need it urgently,
• 4. In regular tetrahedral oabc with edge length 1, if point P satisfies vector OP = x vector OA + y vector ob + Z vector OC, and X + y + Z = 1, then what is the minimum value of modulus of vector OP? It is related to the combination of number and shape
• 5. In triangle ABC, a = 4, B = 1. Angle c equals 45 degrees. What is the area of triangle ABC
• 6. If the line L passing through point a (4,0) and the square of the curve (X-2) + the square of y = 1, what is the range of the slope of the line l If the line L passing through point a (4,0) and the square of curve (X-2) + the square of y = 1, what is the range of the slope of line l
• 7. The equation of a circle whose center is on the parabola y ^ 2 = 2x and whose quasilinear and X-axis are tangent
• 8. It is known that M is a point of hyperbola x ^ 2 / 12-y ^ 2 / 4 = 1 in the first quadrant, and f1.f2 is the left and right focus respectively If the absolute value of MF1 is greater than that of MF2 = 3, then the coordinates of point m are
• 9. As shown in the figure, in the plane rectangular coordinate system, the endpoint coordinates of line AB are a (- 2,4), B (4,2), and the line y = kx-2 has an intersection with line ab Then the value of K cannot be a-5b-2c3d5
• 10. If a point a (4,0) outside the circle x2 + y2 = 4 is used as the secant of the circle, then the trajectory equation of the midpoint of the chord whose secant is cut by the circle is______ ．
• 11. 3 times root 2 times (- 1 / 6 times root 14) times 1 / 7 root under root 17 divided by (root 8 times root 3) -5x & # 179; Y & # 178; × 2XY under the root sign divided by the square of 10 / y under the root sign Root 17 changed to root 18
• 12. What's 17 times the root 11 times 2 --. As the title
• 13. The product of two numbers is 6912, and the greatest common factor is 24. Find: (1) their least common multiple; (2) which groups of natural numbers satisfy known conditions
• 14. There are two numbers a and B, their greatest common factor is 6, the least common multiple is 90, what is the sum of two natural numbers a and B
• 15. The greatest common factor of the two numbers is 15, and the least common multiple is 90. These two numbers are () A. 15 and 90B. 30 and 60C. 45 and 90
• 16. A and B are two continuous non-zero natural numbers whose least common multiple is () and the greatest common factor is () 5 hours 15 minutes = () hours = () hours 7 / 8 kg can represent 1 / 8 of 7 kg and a few parts of () kg If 6-x = 1.8, then 8.4/x = ()
• 17. a. If B is two natural numbers and a = 36, then the greatest common factor of a and B is () and the least common multiple is ()
• 18. It is known that the greatest common divisor of several natural numbers is 4, and the least common multiple is 120. Find two numbers
• 19. It is known that the greatest common divisor of two natural numbers is 4 and the least common multiple is 120 Thank you. I want the process. Please explain why
• 20. Three natural numbers, their least common multiple is 24, the greatest common factor is 3, the sum of these three natural numbers is the largest______ ．