If a > b, C > D, try to compare the size of 2a-3c and 2b-3d The teacher does not allow calculation with special value. Do you want to discuss it by category? It's impossible to be uncertain in size. It's from 4-5 inequality elective course of mathematics~

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• 1. Given B / a = D / C = 7 / 5, then 2b-3d / 2a-3d =? Wrong, it is known that B / a = D / C = 7 / 5, then 2b-3d / 2a-3c =?
• 2. Given B / a = D / C, prove (2a-3c) / (2b-3d) = A / b
• 3. If a / b = C / D = E / F = 2 and 2A + 3d-f is not equal to 0, what is the value of 2A / 3c-e / 2B + 3d-f
• 4. 1： If a / b = C / D = E / F = 2 / 5, find the conclusion of (1) (A-C) / (B-D); (2) (2a + 3c-4e) / (2B + 3d-4f) (3) comparison, and find what rule
• 5. Given that a / b = C / D = E / F = 2 / 3, and 2b-d + 5F = 18, find the value of 2a-c + 5E
• 6. If a / b = C / D = E / F = 1 / 3, then the value of (2a-3c + 4e) / 2b-3d + 4f is___________ .
• 7. Given that a / b = C / D = E / F = 2 / 3, the value of (a + 3c-5e) / (B + 3d-5f) is obtained
• 8. If a / b = C / D = E / F = 2 / 3, then a + 3c-5e / B + 3d-5f =?
• 9. (1) To make a kind of fruit candy packing box, there are two plans: 1. To make a rectangular iron box, 10 cm long, 8 cm wide and 6 cm high. 2. To make a cube iron box, 8 cm long? (2) There are four cuboid columns in front of the gate of a theater. The perimeter of the bottom surface of each column is 3.6 meters and the height is 5 meters. If the surface of these four columns is painted, the painted area is () square meters? (3) A cuboid swimming pool is 50 meters long, 30 meters wide and 3 meters deep. The walls and floor of the swimming pool should be plastered with cement. The area of plastering cement is () square meters? (4) There is a rectangular piece of hard paper, 24 cm in length and 16 cm in width. Cut off the same four corners and fold it along the dotted line to make a paperless carton. The surface area of the carton is ()? The order is a bit disordered, but please answer it for me. I just read it carefully. (although we only need to fill in the blanks, our teacher has to use the formula. I'm forced to be helpless~
• 10. If a and B are reciprocal and C and D are opposite, find 2C + 2d-3ab
• 11. If a / b = C / D = 5 / 7 (2D-3D ≠ 0), then 2a-3c / 2b-3d =?
• 12. 2 / a = 9 / b = 5 / C (ABC is not equal to 0), then a: B = (): (), B: C = (): ()
• 13. In the triangle ABC, the opposite sides of angles a, B and C are a, B, C, Tana is one fourth and tanb is three fifths. Find the size of angle C. if C is equal to number 17, find the length of side a
• 14. In the triangle ABC, the opposite sides of angles a ` B and C are a, B and C respectively. Given that a = 2 and C = 3, how much is B equal to?
• 15. In the acute angle triangle ABC, a, B and C are the opposite sides of the inner angles a, B and C respectively, and satisfy √ 3A = 2bsin A. (1) find the value of tanb; (2) if a + C and B = √ 7, find the area of triangle ABC
• 16. 1. In the triangle ABC, if angle A: angle B: angle c = 1:2:3, then the ratio of the three sides of the triangle is 2. Given that the hypotenuse C and the right edge a of a right triangle are two continuous integers, then the square of the other right edge is equal to () I hope it can be more detailed
• 17. It is known that a, B and C are the opposite sides of three internal angles a, B and C of triangle ABC, 2bcosc = 2a-c If the area of triangle ABC is root 3, find the value range of B. (possible values, I calculate B = π / 3
• 18. In the triangle ABC, given a = 8, B = 60, C = 75, find a, B,
• 19. Given the triangle ABC, a equals 45 degrees, B equals 75 degrees, B equals 8, find the edge a () a: 8 B: 4 C: 4 Given the triangle ABC, a equals 45 degrees, B equals 75 degrees, B equals 8, find the edge a () A：8 B：4 C：4√3－3 D：8√3－8
• 20. In triangle ABC, if ∠ A is equal to 60 degrees, ∠ B is equal to 45 degrees, and ∠ C is equal to 75 degrees, what triangle is this triangle?