Simplification: Question 1: 6x (X & # 178; - x + 1) - (2x + 3) (3x-2) question 2: [(XY + 2) (XY-2) - 2x & # 178; Y & # 178; + 4] / XY most urgent!

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• 1. Given x + y = 2 / 9, xy = - 9 / 10, find 5x & # 178; y + 5xy & # 178; fast Calculation by factorization
• 2. Given X-Y / xy = 2, find the fraction 7x-5xy-7y / 5x-5y
• 3. Given 〡 X-2 〡 + (3-y) ² = 0, find the values of the following formulas, (1) the square of y of X, (2) xy-xy of X
• 4. The square of X - (a + B + CD) * x + (a + b) to the power of 2011 + (- CD) to the power of 2013
• 5. (2a to the third power + 6a) / a calculation Application of factorization
• 6. Given the function f (x) = ax-b / x-2lnx, f (1) = 0 (1) If the tangent slope of function image at x = 1 is 0, and a (n + 1) = f '{1 / [a (n) - N + 1]} - n ^ 2 + 1, we know that a (1) = 4, and prove that a (n) is not less than 2n + 2 (2) Under the condition of (1), the relationship between sum (from 1 to n) 1 / [1 + a (I)] and 0.4 was compared
• 7. Let the angles between two different unit vectors a = (x1, y1,0), B = (X2, y2,0) and C = (1,1,1) in space be equal to π / 4, and find the values of X1 + Y1 and x1 · Y1
• 8. Set the coordinates (x, y) of point P, and determine the position of point P in the coordinate plane according to the following conditions: (1) xy = 0; (2) XY > 0; (3) x + y = 0
• 9. Oxford grade 7 Volume 1 English practice Ask for the answer on page 6 Today is the day Grammar:A , B, C, D. and Listening:A B, C, D. lesson one, please,
• 10. How many four digit numbers are composed of 0, 1, 2 and 3? What formula is used? Can you list these 18 numbers? Let me have a deeper understanding of this type of questions.
• 11. -1 / 2 (4xy-8x & # 178;) + 1 / 3 (xy-6x & # 178; Y & # 178;) simplification. Thank you for that question
• 12. Given that a and B are opposite to each other, X and y are negative reciprocal to each other, | C | = 3, find the value of 1 / 3C (XY) - 2 / 3C (a + b) - 4 / 3C (XY)
• 13. (lgx) ^ 2 + (LG2 + Lg3) lgx + LG2. Lg3 = 0, if two are x1.x2, then x1x2 =? Use the method of setting unknowns
• 14. If X1 and X2 are two of the equations lg2x + (Lg3 + LG2) lgx + Lg3 · LG2 = 0, then the value of x1x2 is () A. 16B. lg6C. 6D. lg3•lg2
• 15. It is known that LG2 = A and Lg3 = B. try to use a and B to represent log125
• 16. Given LG2 = a, Lg3 = B, use a, B to represent log125 (12 in the lower right corner) 12 won't play in the lower right corner of log, so 5 is behind log 12
• 17. Given LG2 = a, Lg3 = B, find log125
• 18. When k is a value, the equation 2 (x-3) + a = K (x-1) about X is a linear equation with one variable?
• 19. The known equation (k2-1) x2 + (K + 1) x + (k-7) y = K + 2=______ When k, the equation is linear=______ &The equation is a quadratic equation of two variables
• 20. If the equation (M's Square-1) x's square-mx-x + 2 = 0 is a one variable linear equation about X, what is the value of the algebraic formula M-1