1.x²-7x+12 2.x²+x-12 3.x²-4x-12 4.x²+10x-24 5.-x²-4x+21 6.(x-1)(x+4)-6 Multiplication by cross

1（x-3)(x-4)
2(x+4)(x-3)
3(x-6）（x+2)
4(x+12)(x-2)
5-(x+7)(X-3)
6(x+5)(x-2)

RELATED INFORMATIONS

1. If √ 7-x & # 178; = X-7, √ X-13 & # 178; = 13-x. simplify | 6-x | + | x-14|
2. (x+1)²+x
3. 7/x²+1/x²-x=0
4. The prescriptive sign "∥" denotes an operation, that is, a ∥ B = √ AB + A + B (a, B ∈ R). If 1 ∥ k = 3 (1) Find the value of K; (2) Find the range of function ∫ (x) = k ∫ X
5. To make the equation x (AX & # 179; + X & # 178; + b) + 3x-2c = x & # 179; + 5x + 4 hold, find the values of a, B and C Seeking process
6. (x + y) & #178; + (x + y) + quarter
7. Decompose the factor to find the complete point 1. Y & # 178; - 9 (x + y) & # 178; 2. (x + y) & # 178; - 16 (X-Y) & # 178; A & # 178; B & # 178; - 0.01 X & # 178; y-2xy & # 178; + y cubic 16 - (2a + 3b) &# 178; (A & # 178; + 4) &# 178; - 16A & # 178; a & # 178; (a-b) &# 178; - B & # 178; (a + b) &# 178;
8. The factor is divided into 16-8 (X-Y) + (X-Y) 2 =___ ．
9. Given the function y = x (x-1) &# 178; (x + 3) &# 179;, find y ^ (6)
10. If the solution set of the system of inequalities x-3 ″ a, b-X ″ - 2 about X is x = 2B + A + 1, find the system of inequalities x-k ″ a, x + K
11. What is 5 π & # 178; × 2 / π? π is either a curvilinear integer or a decimal, or an infinite acyclic number,
12. What is 1 & # 178; + 3 & # 178; + 5 & # 178; +. + 15 & # 178; = equal to
13. Calculate a × (- a ×178; b) of B
14. Carefully observe the following formula: 2 & # 178; - 1 & # 178; = 2 + 1 2²-1²=2+1 4²-3²=4+3 12²-11²=12+11 ① (omitted, meeting) ② Using the law to calculate: 20 & # 178; - 19 & # 178; + 18 & # 178; - 17 & # 178; + +12²-11²=（）
15. AB-AC + bc-b & #178; factorization
16. If AC & # 178; < BC & # 178;, then the relation between a and B is a___ b. (if C is 0, then the inequality does not hold)
17. If A-B = B-C = 3 / 5 and a & # 178; + A & # 178; + A & # 178; = 1, find the value of AC + BC + AC
18. If a = B, then the following formula does not hold: A & # 178; + B & # 178; = A & # 178; B & # 178; a & # 178; = B & # 178; AC = BC, a-c = c-b
19. If the trinomial square difference formula (a + B-C) becomes a square difference formula, which formula should it multiply with
20. The following formula can be calculated by the square difference formula: A. (a + b) (- a-b) B. (a-b) (B-A) C. (a-b) ^ D. (- A + b) (- a-b)