Given the set a = {x | 2a-1 ≤ x ≤ a + 1}, B = {x | x2-5x + 4 is greater than or equal to 0}, if a ∩ B is an empty set, then the value range of real number a is obtained

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• 1. If a is a natural number that is not equal to 0, which result is greater, one-third divided by a or 1 / a divided by 3
• 2. If the square of (5x-3) is 20 and 1 / 4, then x is
• 3. Answers on page 54 of mathematics class assignment book of grade 6 Volume 2 There must be an answer today!
• 4. After learning the operation of rational numbers, teacher Xue gave the students such a problem Calculation: 71 and 5 / 16 times (minus 8) to see who is right and fast. Here is the solution given by the first two students Xiaoqiang: the original formula = - 1151 of 16 times 8 = - 9208 of 16 = - 572 and 1 of 2 Xiao Li: the original formula = (71 + 15 / 16) times (- 8) = 71 times (- 8) + 15 / 16 times (- 8) = - 575 and 1 / 2 Which solution is better? Is there any other solution? If so, please write out the solution of the other method
• 5. Solving the fractional equation: x + (1 divided by x) = 26 / 5
• 6. Given that the function y = √ ax + 1 (a is a constant and a < 0) is meaningful in the interval (- ∞, 1], the value range of real number a is obtained Wait for the line again. OK, there's an additional line~ y=√（ax+1）
• 7. Find the rule and fill in (1) 3 / 8, 1 / 8, 1 / 24, (), 1 / 216 (2), 3 / 4, 1 / 2, 1 / 3, (), 1 / 27
• 8. The shape of Xiaoming's living room is a rectangle, 8 meters long and 4 meters wide. To stick wallpaper on the walls around the living room, at least how many square meters of wallpaper should be used? (the total area of doors and windows is 14 square meters)
• 9. How much square is 432 feet? How much square is one foot? How many square meters is 670 feet?
• 10. Given that | a | = 2, | B | = 2, | C | = 3, and the position of rational numbers a, B, C on the number axis is shown in the figure, then a + B + C=______ ．
• 11. 18 plus 85% of a number is exactly 22. Find the number? Use the formula instead of solving the equation
• 12. Given that circle C1: x ^ 2 + y ^ 2-2mx + 4Y + m ^ 2-5 = 0, circle C2: x ^ 2 + y ^ 2 + 2x-2my + m ^ 2-3 = 0, what is the value of M Given the circle C1: x ^ 2 + y ^ 2-2mx + 4Y + m ^ 2-5 = 0, circle C2: x ^ 2 + y ^ 2 + 2x-2my + m ^ 2-3 = 0, what is the value of M (1): circle C1 and circle C2 are circumscribed, and the equation of the inner common tangent is obtained. (2) circle C1 and circle C2 are included
• 13. Simple calculation of 36 × 25 + 36 × 47 + 36
• 14. The inequality f (2x-1) < f (3) solution set when f '(x) > 0 and y = f (x) are even functions when f (x) is derivable on R and X ∈ (0, + ∞)
• 15. 4.44/4 and 8 points know 5 + 37 points 31 + 111 points 25 + 37 points 35 * 4 and 25 points 11
• 16. Given the quadratic function f (x) = ax ^ 2 + BX + C (1) if a > b > C and f (1) = 0, it is proved that the image of F (x) has two different intersections with the x-axis; (2) it is proved that for x1, X2 and x1-2
• 17. Conversion of degrees, minutes and seconds: 33.33 degrees =? (degrees, minutes and seconds) 36.8 degrees =? (degrees, minutes and seconds)
• 18. 2 (2x-3) - 3x (2x-3) = 0
• 19. Xiao Ming mistakenly multiplied a number by 6 and divided it by 6. Then he wanted to add 19, but he subtracted 19. After such a mistake, the number would be 36. Assuming Xiao Ming didn't make any mistakes, what would be the correct number?
• 20. Given the equilateral triangle ABC, the bisectors of angle B and angle c intersect at O, the vertical bisectors of Bo and co intersect at e f respectively, can you get be = EF = FC?