If (x + 3) (x + m) = the square of X + kx-15, then the value of m-k is a, - 3 B, 5 C, - 2 D, 2 d

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• 1. If (X-5) (x + 3) is determined by the square of X - kx-15, then k =?
• 2. It is known that y is positively proportional to the square of X, and when x = 1, y = 2, find the functional relationship between Y and X, and find out the value of y when x = - 3
• 3. The square of quadratic function y = a (X-H) when x = 0. Y = - 12, x = 1, y = - 27 The square of quadratic function y = a (X-H) when x = 0. Y = - 12, x = 1, y = - 27
• 4. Given that y is positively proportional to the square + 1 of X, and x = - 3, y = 20, then the function relation is
• 5. Observation 1 = 12, 2 + 3 + 4 = 32, 3 + 4 + 5 + 6 + 7 = 52 & nbsp; the general conclusion is () A. 1+2… +n=（2n-1）2（n∈N*）B. n+（n+1）+… +（3n-2）=（2n-1）2（n∈N*）C. n+（n+1）+… +（2n-1）=（2n-1）2（n∈N*）D. 1+2… +n=（3n-1）2（n∈N*）
• 6. 1 = 1 square; 2 + 3 + 4 = 3 square; 3 + 4 + 5 + 6 + 7 = 5 square; 4 + 5 + 6 + 7 + 8 + 9 + 10 = 7 square 1+2+3+...+n=0.5n(n+1)
• 7. 23. (9 points) Observe the following lattice diagram and the corresponding equation to explore the law: (1) Observe carefully and write the corresponding equation on the line after 4 (2) In combination with (1), observe the following diagram and write the corresponding equation on the line after 5 (3) Through conjecture, write the equation corresponding to the nth lattice in (2)_____________________________ .
• 8. Observe the following lattice diagram, observe the following lattice diagram and the corresponding equation, and explore the problems Please guess 1 + 3 + 5 + 7 + 9. +（2n-1)+（2n+1）=？ Please use the above rule to calculate
• 9. What is the 2 / 3 power of the formula x ^ 3 / 6 + O (x ^ 3),
• 10. If f [10x power] = x, then f [5] is equal to the step of solving the problem
• 11. If (x + 3) (x + m) = the square of X + kx-15, then the value of m-k is
• 12. The final question of the first mathematics midterm paper in 2008-2009 Better have an answer
• 13. Using the square difference formula to calculate 2006 times 2008 minus 2007^ 2007^2
• 14. The average heart rate of a normal person is about 70 beats per minute. How many beats per month? (expressed by scientific counting method, 30 days per month) Reminder: expressed by scientific counting method, a month is calculated as 30 days
• 15. A person's normal heartbeat is 70 times per minute, how many times a year? This result is expressed by scientific counting method. A normal person can have a heartbeat several times in his life More than 100 million times
• 16. To the 10th power of 0.25 * (2) to the 20th power? To the 4th power of 2.5 * (16) to the 2nd power?
• 17. Find the square of 3 × 1 / 3 power of 5 × 2 / 3 power of 7
• 18. [- 10 cubic] quartic * 10 quadratic
• 19. If someone's heart beats 75 times per minute, the systolic blood pressure is 1.8 * 10 ^ 4pa, and the average output of blood is 70ml, what is the average power of heart contraction Please answer quickly If someone's heart beats 75 times per minute, the systolic blood pressure is 1.8 * 10 ^ 4pa, and the average output of blood is 70ml, what is the average power of heart contraction
• 20. When the depth of sea water increases by 10 m, the pressure will increase by 1.03 times 10 to the fifth power PA, In the Mariana Trench of the Pacific Ocean, the scientists found a flat fish about 30 cm long 1) The density of seawater? 2) the seawater pressure on the deep fish in the trench? 3) if this kind of fish can be fished, can it be cultured? Explain the reason, (g = 10 / kg)