How to simplify a (3a squared b-ab squared) - (AB squared + 3A squared b)

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• 1. Point out the coefficients of each of the following algebraic formulas: negative 2Ab + 5B 2 / 5A minus 7 / b
• 2. If a + B = - 1, find the value of algebraic formula 3 [a + b] - 5a-5b + 7 Formal addition and subtraction {two}
• 3. If a + B = - 1, what is the value of the algebraic formula 3A (a + b) - 5a-5b + 7
• 4. Given that a: B: C = 2:3:4 and 3a + 5b-4c = 15, find the values of a, B and C
• 5. In △ ABC, if 3a2 + 3b2-3c2 + 2Ab = 0, then Tanc=______ ．
• 6. A-B + C = 5, find the value of a ^ 2 + B ^ 2 + C ^ 2-2ab-2bc + 2ca
• 7. As shown in the figure, use square area to explain the formula: (a + B + C) 2 = A2 + B2 + C2 + 2Ab + 2Ac + 2BC
• 8. Let a, B, C ∈ [0,2], and prove that 4A + B ^ 2 + C ^ 2 + ABC ≥ 2Ab + 2BC + 2ca
• 9. Observe two formulas: the square of a + B + C and the square of a + B + C + 2Ab + 2BC + 2ca,
• 10. Factorization of 2 (a ^ 2-3ac) + a (4b-3c)
• 11. 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
• 12. 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
• 13. 270 ml is equivalent to a few parts of a liter
• 14. 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______ ．
• 15. The median of 37, 48, 52, 48, 39, 52 is (), the mode is (), and the average is ()
• 16. Find the unknown number x 3x-2 × 3 / 4 = 2.1 Come on, let's do the math
• 17. 9.6 / 1.8 * 5.4 calculated by simple method
• 18. x^3+3x^2-13x-15
• 19. Split term method: 1 / 3 + 1 / 15 + 1 / 35 + 1 / 63 + 1 / 99
• 20. Help me solve this equation, (2x ^ 4-3x ^ 3 + 5x ^ 2 + x) (- x + 1) 2011^2-2010*2012