The infinite discontinuity of function f (x) = X-1 / x ^ 2-1 is?

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• 1. 21 vs () = 18
• 2. In the rectangular coordinate system, O is the origin, a (3,1), rotate point a 90 ° counterclockwise around o to point B, then the coordinate of point B is______ ．
• 3. 9.2 - (3.6 + x) = 1.6
• 4. When linear algebra asks what value a takes, the following vector groups are linearly related? A1 = (a, 1,1) ^ t, A2 = (1, a, - 1) ^ t, A3 = (1, - 1, a) ^ t (need the whole process, thank you
• 5. How many natural numbers from 1 to 1998 are squared by 72?
• 6. If sample X1 + 2, X2 + 2 If the average of XN + 2 is 10 and the variance is 3, then the sample 2x1 + 3, 2x2 + 3 The average value of 2xn + 3 is (), and the variance is (), standard deviation Can you write more clearly? I read a lot of similar answers, but I can't understand them Well, I admit that I'm not good at understanding
• 7. 16x2y-16x3-4xy2．
• 8. M is the middle point of BC side in triangle ABC, DM is vertical to em, D and E are on AB and AC respectively, connecting De, proving that De is less than BD = CE
• 9. Calculation: (- 2000 5 / 6) + (- 1999 2 / 3) - (4000 3 / 4) - (+ 1 1 / 2)
• 10. In the observation chart of the problem solution of "innovation class refining" in grade one of junior high school, the numbers corresponding to the four points of ABCD on the number axis are all integers, and their corresponding numbers are ABCD, and C-2A = 7 —.—.—.—.—.—.—.—.—.—.—> A B C D Then the origin should be a or B or C or
• 11. If a and B are real numbers and (5a + 6) square + lb-3l = 0, find the value of a / b
• 12. A total of 1 l of two gaseous hydrocarbon mixtures are burned in air to produce 1.5 l CO2 and 2 l of water vapor A must contain methane B must contain methane, not ethane C must contain ethane but not methane D must be free of ethane
• 13. Through the point m (2,1), make a straight line l-intersection hyperbola x ＾ 2 - (Y ＾ 2) / 2 = 1 at two points a and B, and M is the midpoint of ab. solve the linear l-equation for detailed solution,
• 14. Solution equation: (2.5x + x) * 1.4 = 11.9
• 15. （1） (a²+b²)²-a²b² （2） 49（a-b）²-16（a+b）² （3） a²b²-2ab+1 （4） 9-12a+4a² （5）4x²+4x+1 （6） x²-6xy+9y²
• 16. What is the number of a three digit number, which is 18 times the sum of hundreds, tens and ones, equal to itself?
• 17. Explain quadratic function and power function
• 18. If f (x) satisfies f (x) + 2F (1 / x) = 5x + 4 / x, then f (x)=
• 19. Solve a few questions 1. If there is a point on the line y = - 3 / 1 x-4, the distance from P to X axis is 2, then the coordinate of point P is______ 2. If the fractional equation x-3 / X-1 = x-3 / MX has no solution, then the value of M is______
• 20. Factorization 2009 + 2009 ^ 2-2010 ^ 2