If 2A = 3b, then the square of 2A / the square of 3b is equal to, why

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• 1. What is the square of (2a + 3b) multiplied by the square of (2a-3b)
• 2. How to calculate the negative square of (2a + b) Please, the teacher is really, in the first volume when teaching the second volume, do not know
• 3. Calculation: (- C / 2A square B)
• 4. Calculation (2a + B-C) (2a + B + C)
• 5. (A-3) square - (2a-6) = ()
• 6. (square of a-2a) (square of a-2a-6) + 9
• 7. Then the value of (A-3) (a + 6) (a + 5) (A-4) + 20 is
• 8. 2 (2a + a) - 11 (2a + a) - 6 It should be 2 (square of 2A + a) - 11 (square of 2A + a) - 6
• 9. 6 (the square of a - 2A + 3)
• 10. Square two of a + 2A (B + C) + (B + C) quadratic
• 11. Given that the square of 2a is equal to 3 and the square of 3b is equal to 2, find the value of ab Then find the value of (2 ^ 2A + 3 ^ 3b) (2 ^ 2a-3 ^ 3b)
• 12. Calculation: (- a 2 / 4) + (2-A 1 / 4)
• 13. (2a square minus 2 / 3 a minus 4 / 9) times (- 9a)
• 14. 1 / A-3 minus 1 / a square-9 minus A-1 / 6 + 2A
• 15. (urgent) x, y and Z are real numbers which are not all zero. The denominator is the square of X + the square of Y + the square of Z, and the numerator is XY + 2yz Function part It's all wrong. It's different from the answers at the back of the book.
• 16. What is the maximum value of three positive real numbers (XY + 2yz) / (the square of X + the square of Y + the square of Z)
• 17. If real numbers x, y, Z satisfy x2 + Y2 + Z2 = 1, then the maximum value of XY + YZ is___ ．
• 18. Mathematics problems in grade one of junior high school (solving equations and calculating) (1) To solve the equation: 150x/(1-60%)=150(x+20)/(1-15%) (2) Calculation: 48+20-[12000*(1-20%)/150] [Note: solving equations and calculating need to write process]
• 19. The equations 2x − y = − 33x + y = 8 and ax + by = 2aX − by = 4 have the same solution, and the values of a and B are obtained
• 20. Given that {x = 3, y = 1 and {x = 2, y = 11 are solutions of AX + by = 7, what are the values of a and B?