The coefficient of quadratic term is 1

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• 1. How to use cross multiplication when the coefficient of quadratic term of factorization is not one
• 2. Find the cross multiplication formula with coefficient of quadratic term not 1!
• 3. Calculation: (200 + 198 + 196 +) +2）-（1+3+5+… +199）=______ ．
• 4. 1 3 5 7 9 how many possibilities are there for these five numbers to form a password of four numbers? Please write all of them (those in different order are also counted) Like 1357 7531 What I want is 120 kinds of specific data, but there will be no repetition of 1133 Don't answer if it's too much trouble Absolutely necessary, because I forgot the password of my laptop lock (physical lock). I only remember the odd number without repetition
• 5. Given that one part of X + X is equal to 3, find the square of (one part of x-x),
• 6. Isn't 8.1 △ 4.2-0.3 △ 2.1 plus 3 / 7 equal to 19 / 14?
• 7. 1,4 / 9 × () = 7 / 8 △ () = (): 16 = 0.75 = () 2. 3 / 4 of a number is 60 1,4 of 9 × () = 7 of 8 △ () = (): 16 = 0.75 = () () 2. Three fourths of a number is 60, and five sixths of the number is () 3. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 280. Given that the difference is 3 / 5 of the subtracted, then the difference is () 4. One fourth more than 40 tons is () tons, and () meters is 1 / 4 shorter than 2 / 3 meters 5. When Xiao Wei calculates a number divided by 4 / 9, he carelessly calculates a number multiplied by 4 / 9, and the result is 32. The correct result of this division problem is () 6, 1 / 2 of a is equal to 2 / 3 of B, a is 18, B is () 7. Choose the appropriate number from 4 / 5,3.6,12,8,0.45 and fill in the brackets, so that each question can be calculated in a simple way. (each number can only be used once.) (5 / 12-1 / 4 + 2 / 3) × (), 4 + () × 69 / 31 × 5, 6.4 + 0.55 + () + (), 1.25 × 0.79 × () 8. The number of peach trees is three fifths more than that of pear trees. The ratio of pear trees to peach trees is ()?
• 8. Sequence 1 / (1 + 2), 1 / (2's square + 4),. 1 / (n's square + 2n) The sum of the first n terms of
• 9. The square of the difference between 2x and 1 is 16. Find X
• 10. The square of X + 7x + 6 = 0
• 11. If the square of the algebraic formula 2A + KAB + b-6ab + 9 does not contain AB term, the value of K is obtained
• 12. When x = 1, the value of the cubic power + QX + 1 of the algebraic formula PX is 2009. When x = - 1, the value of the cubic power + QX + 1 of the algebraic formula PX is calculated
• 13. It is known that the polynomial x ^ 3-kx + 6 has a factor X + 3. Find the value of K
• 14. If one factor of polynomial x ^ 4 + MX ^ 2 + 3x + 4 is x ^ 2-x + 4, find the value of M and another factor
• 15. Let a = (a ^ 2 + 1) (b ^ 2 + 1) - 4AB 1 2. Let a = 0, find the value of A.B
• 16. Proof: real coefficient polynomials of degree 3 or more can be factorized The results of decomposition are all polynomials with real coefficients,
• 17. Write a quadratic equation of one variable according to the following requirements, and find their roots by factorization. (1) one root is 0, the other root is negative (2) One root is a positive number and the other is between - 3 and - 1
• 18. Find the greatest common divisor and the least common multiple of 336 and 1260
• 19. The common factor of polynomial 2 (x-3) + X (3-x) is Why not 3-x? The answer is x-3
• 20. What is the greatest common factor of 0