Define a new operation: X * y = (x + 2Y) / (X-Y), then a * B × [b * (- a)]=______________

（-2a²+2b²-3ab）/（a²-b²）

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1. A new operation is defined, which stipulates: a * b = 4AB, for example, 2 * 3 = 4 × 2 × 3 (1) find the value of - 4 * 5 (2) find the value of - 2 * (- 3 * 4) Detailed process
2. Define an operation: 2! = 2 * 1, = 3 * 2 * 1, = 4 * 3 * 2 * 1. By analogy, try to calculate 100! / 98=________ .
3. Define a kind of operation [?
4. If we define an operation "*": a * b = A-B / AB-1, try to find the value of 2 * (- 3 / 5) Such as the title
5. 2 (X-Y) + 1 / 2A & # (Y-X) factorization
6. Decomposition factors: (2a + b) &# 178; - (a-b) &# 178;, (X & # 178; + Y & # 178;) (X & # 178; + Y & # 178; - 4) + 4, the process is more detailed
7. 3a-12a^2+18a^3 Factorization
8. 3a^3-6a^2+12a
9. Calculation: (12a ^ 3-3a) / (3a) - (2a) ^ 2
10. 12a^6-3a^b^2
11. Define a new operation a $B = a + B-1, a & B = a * B-1, if x $(X & 4) = 30, x =? Everybody, hurry up
12. A new operation is defined, which defines a ∧ B = A2 + 2Ab, such as 3 ∧ (- 2) = 3 & # 178; + 2 × 3 is called (- 2) = - 3 1. Find the value of 2 × (- 1) 2. If 2 × (an unknown number) = 2, find the value of X 3. If - 2 ＊× = 2 + ×, find the value of ×
13. If a new operation a * b = A-B & #, then (- 5 * 3) * - 2=
14. Now we define the operation a ⊕ B = AB, a ⊗ B = a (1-B), then M2 ⊗ (m ⊕ n)=______ ．
15. Define an operation in the range of rational number, the rule is: a * b = ab-b & # 178; (1) if (2x + 1) * - 3) = 0, find the value of X
16. Define a kind of operation with ＊: for rational number a, B, there is a ＊ B = A & # 178; + ab. if (- 3) ＊ x = 15, then the value of X is ()
17. Define AB = A & # 178; - B, then [(1 -) 2] (- 3)=
18. If a and B are rational numbers, we define a new operation "*" such that a ⁃ B = 2a-b, then (5 ⁃ 3) ⁃ 1=______ ．
19. If a new operation a * b = AB / 2A + 3b is defined, then (- 3) * 1 =?
20. First simplify, then evaluate: LX + 1 − 1x2 − 1 △ x + 1x2 − 2x + 1, where x = 3-1