x^3+3x^2-13x-15

-5 -1 3

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1. 9.6 / 1.8 * 5.4 calculated by simple method
2. Find the unknown number x 3x-2 × 3 / 4 = 2.1 Come on, let's do the math
3. The median of 37, 48, 52, 48, 39, 52 is (), the mode is (), and the average is ()
4. If the solution set of the inequality system 5x + 1 ＞ x + 9x ＞ m + 1 about X is x ＞ 2, then the value range of M is______ ．
5. 270 ml is equivalent to a few parts of a liter
6. If (the M-1 power of X multiplied by the N + 4 power of Y) multiplied by (the 5m power of X multiplied by Y) = the fifth power of X multiplied by the sixth power of Y, the n power of M is calculated
7. How to simplify 3A's square + 5A's square + b-ab Good answer, additional points! Given that A.B is the root of two real number solutions of equation 3x + 4x-7 = 0, find the value of 3A's square + 5A + b-ab
8. How to simplify a (3a squared b-ab squared) - (AB squared + 3A squared b)
9. Point out the coefficients of each of the following algebraic formulas: negative 2Ab + 5B 2 / 5A minus 7 / b
10. If a + B = - 1, find the value of algebraic formula 3 [a + b] - 5a-5b + 7 Formal addition and subtraction {two}
11. Split term method: 1 / 3 + 1 / 15 + 1 / 35 + 1 / 63 + 1 / 99
12. Help me solve this equation, (2x ^ 4-3x ^ 3 + 5x ^ 2 + x) (- x + 1) 2011^2-2010*2012
13. A simple algorithm of 75 15 / 16 times [- 8] (71 + 15 / 16) * (- 8) = 71 * (- 8) + 15 / 16 * (- 8) = - 568-7.5 = - 575.5 this method is not needed, but another simple calculation is needed
14. If we know that the power of X + X + 1 / x = 1 / 4, then the power of 3x is 5x / 4 - 15x + 5=
15. What are the least common multiple, greatest common factor and least common multiple of 12, 54 and 72?
16. What is the monotone decreasing interval of the function y = x Λ 2-2x + 3?
17. Find the solution of X multiplied by 50 / 2-x equal to 300
18. (2-1)(1+2+2²+2³+…… +2 62nd power + 2 63rd power =?
19. What is (√ 18 - √ 1 / 2) × √ 8? Problem solving process~
20. For the solution of square root equation, if it is fast, give another 5 points. The topic is: the first (x-1) square = 289, the second (3x-1) square = 25