Factorization factor (2a + b) (b-2a) - B (5b-8a)

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• 1. Factorization 3A ^ 3b-12ab ^ 3 + 9A ^ 4B ^ 2-36a ^ 2B ^ 4
• 2. Given a-2a + 4B + 4B + 2 = 0, the value of a + B is
• 3. Given a 2 + B 2 + 2a-4b + 5 = 0, find the value of 2A 2 + 4b-3
• 4. There are some coal, a alone transport six days to complete, B alone transport five days to complete, now a transport three times, B transport two times, a total of 18 tons, the original total of how many tons?
• 5. After handing over the cargo at a, the two cargo ships of a and B sailed to the East and west respectively. After 1 hour, ship a sailed 10 nautical miles and ship B sailed 8 nautical miles
• 6. The speed ratio of car a and car B is 5 to 4. After meeting, car a and car B go on at the same speed The speed ratio of a and B is 5 to 4. After meeting, car a and car B continued to move forward at the original speed. When car a arrives at B, car B is 60 kilometers away from A. how many kilometers did car B travel when they met?
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• 9. The two vehicles a and B depart from two places 360 km apart. It is known that the speed of vehicle a is 60 km / h and that of vehicle B is 40 km / h. If vehicle a drives 1 km / H first, the speed of vehicle B is 40 km / h
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• 11. 4a+4b／5ab × 15a²b／a²-b²
• 12. It is known that a = A & # 178; - 2b + π / 2, B = B & # 178; - 2C + π / 2, C = C & # 178; - 2A + π / 2, where a, B and C are real numbers, Verification: at least one of a, B and C is positive
• 13. Given A-B = 2, then the value of algebraic formula 3 (a-b) 2 + 2b-2a is______ ．
• 14. If the binomial trinomial X & # 178; - ax + 2a-3 of X is a complete square, then the value of a is
• 15. If X & # 178; - ax + 2a-4 is a complete square, find the value of A
• 16. Given x + y = 2, xy = 0, find X & # 178; + Y & # 178; and (X-Y) &# 178;
• 17. Given that x, y ∈ R, try to compare the size of X & # 178; + Y & # 178; + 1 and XY + X
• 18. (- 2A) times a - (- 2A) square
• 19. The second problem is as follows: a (a-b) - B (a + b) =?
• 20. The square of (2a + b) multiplied by the square of (2a-b)