The perimeter formula of trapezoid is

(a + b) H △ 2 the sum of the bottom and the top multiplied by the height divided by 2

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1. 27 ° 15 ′ 36 ″ = () degree
2. How to solve the equation X-1 / 4x - (1 / 4x-4) = 50
3. 1 5 19 81 411 () rule What are the rules in brackets
4. 1, the solution of the equation 2 / 1 {x-3 / 1 [x-4 / 1 (x-3 / 2) - 3 / 2} = x + 4 / 3 is (). 2, the equation of X: 2A + 5x = 7x-2b (a, B are known numbers), () Urgent! If you are satisfied with the answer, I will give you satisfaction points!
5. How much is 2010 66... 6 times 2010 99... 9
6. AB and CD are two parallel chords of circle O, which are located at the same side of the center O. if AB = 6 and CD = 8, the distance between AB and CD is 1, the radius of circle O is calculated
7. When Xiaochun calculates a division, he takes 72 as 27, the result quotient is 14, and the remainder is 18. What is the correct number?
8. Δ ABC is an equilateral triangle, point E is the point on the extension line of BC, the vertical bisector of be is called AC at point D, and the perpendicular foot is m, CE = CD
9. Xiao Ming asked his father how old he was, and he said, "divide my age by 6, add 14, multiply by 3, and finally subtract 27. It's 33 years old."
10. Solution equation: 2x + 4 = - 3x + 15
11. Simplify the following positive and negative numbers: Ji - (- 68) - (+ 0.75) - (- 3 / 5) - (+ 3.8)
12. Simplify the following numbers - (+ 0.75), - (+ 3.8), - (- three fifths), - (- 68)
13. 1 / 3, 5 / 9, 19 / 27. What is the eighth number?
14. Simple operation 79 △ 115 + 29 × 511 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4 × 1.28 × 25 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (58 + 127) × 8 + 1927
15. 27: () = 1 / 16 () = 0.375 = () 24
16. (): () = 0.375 = 27: () = 32 of what
17. 16.78-2.54. - 3.32-1.46?
18. 162 out of 84
19. What is 84 / 162 simplification?
20. Simplification + [- (+ 7)], [- (- 2.3)], - [+ (- 1 / 4)]?