A factorization problem in grade one of junior high school (3x-1)(2x+3)-(x+3)(x-3)

6x^2+7x-3-x^2+9
=5x^2+7x+6

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1. Several simple factorization problems~ (1) (2x-3y)^2 - 4a^2 (2) x^4 - 2x^2 + 1 (3) x^2 - a^2 - 2x - 2a (4) 4x^2 - 4xy + y^2 - a^2 (5) (x + y)^2 - 2(x + y ) - 3 (6) x^2 - 2xy -3y^2 + x + y
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3. Solving 20 factorization problems X^3-X^2+X-1 AX+AY+X+Y 5MA+5MB-A-B M^2-MN-5M+5N A^2-B^2-2A+2B M^2-N^2+2M+2N AX^2-A^3-2AX-2A^2
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9. x²-4xy-1+4y²= 7.77²+4.46×7.77+2.23²= There must be a process. Let's go, brothers
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12. Factorization: 1、6q(p+q)-4p(p+q) 2、x(x-y)^2-y(x-y)^2 3、x(x+y)(x-y)-x(x+y)^2
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15. A right angled trapezoid has an upper base of 8 cm and a lower base of 15 cm. Cut out the largest triangle in the right angled trapezoid, and the remaining area is 37.8 square cm Q: what is the area of the original trapezoid?
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17. If a commodity is sold at a 10% discount, it will make a profit of 20 yuan. If it is sold at a 70% discount, it will lose 10 yuan How many yuan? (use the equation of one yuan once, put a problem into a formula and answer it in detail)
18. Several mathematics problems in grade one of junior high school~ In a certain month, Mr. Wang will participate in three days of business training. The sum of the numbers of the three days is 39. If the training time is three consecutive days, then the three days are respectively the 12th, 13th and 14th. If the training time is three consecutive weeks of Saturday, what are the dates of the month, the 13th and the 14th? According to the regular arrangement of a column of numbers: 2, - 4,8, - 16,32, - 64,..., in which the sum of some four adjacent numbers is - 640, how much is the difference between the maximum number and the minimum number of these four numbers? [Note: the solution of column equation is urgent!]
19. The price of Haier computer is 2 / 11 lower than the original price. Now the price is 3600 yuan. How much is the original price
20. 2.The probability of A’s winning a hockey match is 3/2 times the probability of B’s winning a cricket match.The probability of C’s winning a race is twice the probability of B’s winning the cricket match.What is the maximum probability of A’s winning the hockey match? (A) ¼ (B) ½ (C) 2/3 (D)¾ (E) 1