2 / 3 + 4 - (2 / 3 + 5 / 7) simple calculation

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• 1. The equation of one variable and one degree 3-4x=2-x 0.2x+1=-1.8x 3/1x=9-3/2x
• 2. It is proved that the value of the determinant of a real symmetric matrix is equal to the product of its eigenvalues?
• 3. Factorization (2 - √ 5) ^ 2009 (√ 5 + 2) ^ 2010
• 4. If the distance between point P and X axis is 4 and P (3, x), then x = ()
• 5. If f (x) satisfies 2F (x) + F (- x) = 5x + 4, find f (x) and f (- x)
• 6. It is known that the quadratic function f (x) is an increasing function in the domain of definition (0, ∞), and f (XY) = f (x) + F (y). F (2) = 1 1 to prove f (8) = 3
• 7. A two digit number is equal to three times of the product of the numbers on each digit. The number on the tenth digit is 2 less than the number on the single digit. How many are the two digits? Use the 2-ary equation
• 8. In daily life, such as withdrawal and Internet access, passwords are needed. There is a kind of password generated by "factoring" method, which is convenient for memory. The principle is: for example In daily life, such as withdrawing money and surfing the Internet, we need a password. There is a kind of password generated by factorization, which is convenient for memory. The principle is: for polynomial x4-y4, the result of factorization is (X-Y) (x + y) (x2 + Y2). If x = 9, y = 9, then the values of each factor are: X-Y = 0, x + y = 18, X2 + y2 = 162, so "018162" can be used as a six digit password, When x = 10 and y = 10, the password generated by the above method is:______ Just write one
• 9. 1 / 2 (5x + 7 / 3) = 1 / 3 (6x-2 / 5) - 1 / 6 (x + 4) to solve the equation, I calculate - 8, right? Please say the reason for 8. Thank you. The correct answer is - 4. You have to go to the denominator first. The question is wrong. It's not 2 / 5, it's 5 / 2. The answer is - 4
• 10. Through the point B (2,1), make a straight line L intersection hyperbola x square - y square / 2 = 1 at two points a and B, and M is the midpoint of AB, find the equation of straight line L
• 11. If X & sup2; - 4Y & sup2; = - 15,2y-x = 3, then x + 2Y=______ . ..
• 12. The second power of (- 5 / 8) x (- 4) - 0.25x (- 5) x (- 4)
• 13. Find the unknown x (12%) (1) 3:8 = x: 2.4 (2) x: 5 =: 0.5 (3): x = 6
• 14. It is known that the range of function y = Log1 (2 ^ x-a + 2) is r, a
• 15. The inequality K (x-1) with respect to X is greater than 2x-3
• 16. If PQ is a function f (x) = LNX, X belongs to any two different points on the image of [2,5], then the range of the slope of PQ is?
• 17. 3x & sup2; - 7xy-20y & sup2; to prove x = 4Y or 3x = - 5Y, there is another question 49 (x-3) & sup2; = 16 (x + 6) & sup2;
• 18. What two numbers are reciprocal to each other?
• 19. Given that real numbers x and y satisfy (2x + Y > = 4,3x + y = - 4), then the value range of Y-2 / X-2 is The process can take only x, Y values
• 20. Solving equation 25-2x = 5 + 2x