How to solve x-0.36x = 16 X-0.36X=16 X-0.36X=16 How does (1-0.36) x = 16 (the "1" in this place) increase 0.64x=16 x=25

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• 1. On the slope of a straight line If the slope of a straight line is less than - 1, why is the range of inclination angle not 90 to 135? Is it 90 to 135 or 135 to 180? The college entrance examination will be held tomorrow
• 2. If FX = 1 / 3x ^ 3-F (1) x ^ 2 + 2x + 5, then f (2)?
• 3. Let f (x) defined on R satisfy f (x + y) = f (X-Y) = 2F (x) f (y) and f (π / 2) = 0 for any x, y ∈ R If f (0) ≠ 0, try to find f (π), Get rid of talking in detail. If I speak well, I will understand it after reading it once or twice. I will add at least 50 points Let f (x) defined on R satisfy f (x + y) + F (X-Y) = 2F (x) f (y) and f (π / 2) = 0 for any x, y ∈ R, If f (0) ≠ 0, try to find f (π), There's a little mistake on it. It's not an equal sign, it's a plus sign. I understand it after one or two times. I'll add at least 50 points
• 4. The following calculation is correct: A: 3Y / X △ 3xy = x ^ 2 B: 3Y / x ^ 2 △ X / 3Y = 1 / X C: X △ y * 1 / y = x D: A / A ^ 2-1 * A-1 / a = 1 / A + 1
• 5. The following statement is correct () A. When two numbers are added, the sum is greater than any addend B. when two numbers with different signs are added, the sum is less than any addend C. when two numbers with equal absolute value are added, the sum must be equal to zero D. when two numbers are added, the sign of the larger addend is taken as the sign of the result
• 6. Monotone interval of function y = LG (1 + x) + LG (1-x)
• 7. After a decimal and its own addition, subtraction and division, the sum of sum and difference quotient is 10.4. What is the original decimal?
• 8. It is known that the domain of definition of function f (x) is (- 5,5) and satisfies the following conditions: F (x) is an odd function, (2) f (x) decreases monotonically on the domain of definition, (3) f (1-A) + F (2a-5)
• 9. The positions of known numbers a, B and C on the number axis are as follows: C < a < 0 < B simplify | a + B | - | c-b|
• 10. It is known that f (x) = ax ^ 3 + BX ^ 2 + CX (a is not equal to 0) obtains the extremum when x = ± 1, and f (1) = - 1,1) tries to find the value of constant ABC It is known that f (x) = ax ^ 3 + BX ^ 2 + CX (a is not equal to 0) obtains the extremum when x = ± 1, and f (1) = - 1,1) tries to find the value of constant ABC; 2) tries to judge whether the function obtains the minimum or maximum when x = ± 1, and explains the reason
• 11. Find the slope, inclination angle and intercept on the Y-axis of the following line 1.2x + y + 3 = 0.2.x5-y4 = 0.3.x-2y = 0.4.x = y
• 12. What's seven thirty minutes minus thirty-four minutes
• 13. In the rectangular coordinate system, there are four points a (- 8, 3), B (- 4, 5), C (0, n), D (m, 0). When the perimeter of the quadrilateral ABCD is the shortest, we can find the value of Mn
• 14. What is 1.225 + 2.225 + 3.225 +. + 50.225? I'm waiting to use it. I'd better tell the rules. I'll do it later Another question: (2008-1) + (2007-2) + (2006-3) +... (1005-1004) also tell me the rules and answers
• 15. Equation: how to solve 2x + 3x = 60? How to solve 3.6x-2.8x = 12?
• 16. Given that the coordinates of point a are (0.6,0.8), rotate OA anticlockwise around the origin of coordinates by 2 / 3 to OA, then the coordinates of point a are (0.6,0.8)__
• 17. if X@Y=X+ (x + 1) + (x + 2) +... + (x + Y-1), where x and y are natural numbers, and 1@50 The value of
• 18. 10. Y is two different numbers selected from the first 500 natural numbers, and X is greater than y, 1. Find the maximum value of X + Y / X-Y, 2. Find the minimum value of X + Y / X-Y
• 19. Let X and y be two different numbers selected from the 500 natural numbers from 1 to 500, then the maximum value of (x + y) / (X-Y) is () A. 1000B. 990C. 999D. 998
• 20. X and y are two different numbers selected from natural numbers within 50. Find the maximum value of X + y of X-Y