Due to the erosion of wind and rain, the height of a pyramid in Egypt is only 140 meters, which is 21 times lower than when it was built How many meters will it be when it is built

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• 1. The height of the Egyptian pyramid is about 140 meters, 121 meters lower than when it was built. How many meters higher was it when it was built?
• 2. The height of the Egyptian pyramid is about 140 meters, 121 meters lower than when it was built. How many meters higher was it when it was built?
• 3. Judgment: the absolute value of a rational number is not less than itself Judgment 2: if the absolute values of two numbers are equal, then the two numbers are opposite to each other
• 4. When x is in what range, the absolute value of x minus 1 minus x minus 2 has the maximum value and the maximum value can be obtained
• 5. 5 minus the absolute value of x plus 1, what is the maximum value of X What is the value of X, Absolute value of 5 minus x plus 1 Take the maximum. What is the maximum
• 6. Given that the absolute value of a = the absolute value of B, the relationship between a and B is expressed by equation?
• 7. The approximate value of PI is between 3.1415926 and 301415927. If five significant digits are reserved, what is the approximate value and how many digits are accurate
• 8. Given the function f (x) = ax & # 178; + BX + C, the image passes through the point (- 1,0), The inequality x ≤ f (x) ≤ 0.5 (1 + X & # 178;) holds for any x ∈ R, and the analytic expression of function f (x) is obtained
• 9. It is known that the functions y = ax and y = - BX are decreasing functions in the interval (0, + ∞). Try to determine the monotone interval of the function y = AX3 + bx2 + 5
• 10. The maximum value of the function y = 2x ^ - 2 in the interval [1,3] is_____
• 11. Simplification: (1) 27 − 123; (2) (2 + 3) 2 (5-26)
• 12. The sum of the opposite number of 75 and the absolute value of - 24
• 13. There is a "24 point" game. The rules of the game are as follows: take any four integers whose absolute value is between 1 and 13, and mix the four numbers (each number can only be used once) to make the result equal to 24. The existing four rational numbers 2, - 4,8,11 use the above rules to write three different operation methods to make the result equal to 24,?
• 14. As shown in the figure, it is known that the area of the square oabc is 9, point O is the origin of the coordinate, point a is on the x-axis, point C is on the y-axis, point B is on the image of the function y = KX (k > 0, x > 0), point P (m, n) is any point on the image of the function y = KX (k > 0, x > 0). Through point P, make the perpendicular lines of the x-axis and y-axis respectively, and the perpendicular feet are e and F, and let the plane of the non coincidence part between the rectangular oepf and the square oabc The product is S. (1) find the value of the coordinates of point B and K. (2) find the coordinates of P when s = 92. (3) write the functional relation of s with respect to M
• 15. Please write two congeners of - 1 / 3xy & # 178;, and make these two congeners merge into 1 / 2XY & # 178;, then these two congeners can be----
• 16. If (x ＾ m ＾ x ＾ 2n) ＾ 3 ＾ (x ＾ 2m-1) and 2x are of the same kind, and M + 5N = 13, find m ＾ 2-25n ＾ 2
• 17. Given that x|k| [absolute value] + 21 = 0 is a linear equation with one variable, then K=
• 18. Through the origin, make the secant of the square of the sum of circles x + 1 plus the square of Y minus 2, intersect the circle at two points a and B, and find the trajectory equation of the midpoint of chord AB and m
• 19. If the line L1 passes through the point (3,0), the line L2 passes through the point (0,4), and L1 / / L2, if D represents the distance between L1 and L2, then the value range of D? RT
• 20. If the absolute value of M × n is ≥ 2 √ 3, what is the range of K?