In △ ABC, ∠ ACB = 90, CD is the height of edge AB, AC = 15, BC = 20, find the length of AD and BD

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• 1. What's the difference between the use of past participles as postpositive attributives and passive voice! A:What are on show in the museum B: Some pictures (draw / were draw) by the Africans
• 2. Please write down the meaning of this abbreviation: CBA__________
• 3. The difference between trousers and pants in English Tell the difference between trousers and pants in English,
• 4. The sum of numerator and denominator of a fraction is 47. If 9 is subtracted from denominator, the fraction is equal to 1. What is the original fraction?
• 5. Piano ends with O. why does it add s when it becomes plural? Does it belong to the case that the ending is vowel + O?
• 6. X minus one twelfth minus five twelfth equals one fourth
• 7. The use of prepositions in the classroom
• 8. Ad is the middle line of triangle ABC, AE is vertical AB, AF is vertical AC, and AE = AB, AF = AC, connect EF, verify: ad = 2 / 1ef
• 9. I is the inner part of triangle ABC, ID is perpendicular to BC and CI extension line AB intersects with E
• 10. Make the following words plural 1.a piece of beef 2.a cup of tea 3.a bottle of juice 4.a box of glass
• 11. Ten English questions in the present continuous tense Please change the following verbs to the correct form of the present progressive (note that sometimes it's the third person singular) 1. The phone ____ . Please answer it. (ring) 2. Look! Your baby _____ . (smile) 3. Listen! Somebody ____ in the next room. (sing) 4. Mr Smith _____ a book now. (read) 5. The Smiths ______ TV now. (watch) 6. Joyce and Joseph _____ a car now. (push) 7. A girl and her friends ____ tea at the moment. (drink) 8. Slow the car down. You ____ too fast. (drive) 9. We ____ to plan our holiday now. (begin) 10. The woman ____ a novel these days. (write)
• 12. Given ax ^ 4 + BX ^ 3 + CX ^ 2 + DX + e = (X-2) ^ 4, find the value of a + B + C + D + E and the value of a + C
• 13. Given the position of ABC on the number axis, as shown in the figure below, simplify a / | ab | + 1 / | B | - 2BC / | BC| Figure: a-b-0-c
• 14. The range of function f (x) = 3 ^ (2x) - 2 * 3 ^ x-3 is
• 15. It is known that f (x) and G (x) are odd and even functions on (- A, a) respectively. It is proved that f (x) · g (x) is odd function on (- A, a)
• 16. If the function y = cos (ω x + π / 2) is monotonically increasing on (0, π / 4), then the value range of ω? If the function y = cos (ω x + π / 2) increases monotonically on (0, π / 4), then the value range of ω? A (-∞,2) B [2,0) C (0,2] D[2,+∞)
• 17. If two numbers are opposite to each other, their absolute value? Sign? Is the opposite number equal to itself? Is the absolute value equal to itself? What is the absolute value equal to its opposite number?
• 18. Given that a, B and X are positive numbers, LG (AX) LG (BX) + 1 = 0, the range of a / B is obtained? LG (BX) LG (AX) + 1 = 0, and a, B, X are positive numbers Then (LGA + lgx) (LGB + lgx) + 1 = 0 (lgx)^2+（lga+lgb）lgx+1+lgalgb=0 This equation has a solution So (LGA + LGB) ^ 2-4lgalgb-4 ≥ 0 (lga)^2+2lgalhb+(lgb)^2-4lgalgb-4≥0 (lga-lgb)^2≥4 LGA LGB ≥ 2 or LGA LGB ≤ - 2 LG (a-b) ≥ 2 or LGA / b ≤ - 2 So a / b ≥ 100 or 0
• 19. Given a = 1 / 2x ^ 2y-1 / 3xy, B = 3xy + 2 / 3Y ^ 2. Find a + B and a-b
• 20. For any real number x, y, f (x + y) + F (X-Y) = 2F (x) cosy, f (0) = 0, f (π / 2) = 1 (2) Proof: F (x) is an odd function and a periodic function