Find the rule, fill in 1, 8, 27, (), (), (), write the process (that's why this is the calculation process)
1. The general formula of 8, 27, (64), (125), (216) is n
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- 1. Simplification (4 / (√ 2 + 2) + 4 / (2 + √ 6) + 4 / (√ 6 + √ 8) +... + 4 / (√ 2012 + √ 2014) (√ 2014 + √ 2)
- 2. How to calculate 2 + 4 + 6 + 4 + 2012 + 2014
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- 6. 1×2/1+2×4/1+4×6/1…… +How much is 2010 × 2012 / 1?
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- 8. Can SiNx + cosx be greater than 1?
- 9. 4x-3 + 3x-4 = 14 solution 2 (X-2) + 2 = x + 1 solution 7x-16 = 66 + 2x solution 7 (x + 6) - 3x = 4 (2x + 5) solution 5x + 15-2x-2 = 16 solution
- 10. 2.5x-4.5 = 3x + 5.5 urgent and checking calculation
- 11. 1 8 27 () find the law
- 12. Find the law, 1,8,27, (), () 1、1、3、4、7、9、15、16、31、25、( )、( )、( )、( )
- 13. 1x2 / 2005 + 2x3 / 2005 + 3x4 / 2005 + 4x5 / 2005 + 10 2005 out of 10 2004x2005 = ()
- 14. 1x2/2005+2x3/2005+3x4/2005+4x5/2005+.+2004x2005/2005=? Please tell me the calculation process again
- 15. 20051×2+20052×3+20053×4+20054×5+… +20052004×2005=______ .
- 16. Observation: 2 = 1 * 2, 2 + 4 = 6 = 2 * 3 = 12 = 3 * 4, 2 + 4 + 6 + 8 = 20 = 4 * 5,..., calculation: 2002 + 2004 + 2006 +... + 2050
- 17. 2 = 1 * 2,2 + 4 + 6 = 12 = 3 * 4,2 + 4 + 6 + 8 = 20 = 4 * 5,... Calculate 2002 + 2004 + 2006 +... + 2050 according to the above formula
- 18. 1x2+2x3+3x4+4x5+.+15x16
- 19. If M is a real number and the opposite number of a root of equation x2-3x + M = 0 is a root of equation x2 + 3x-3 = 0, then the root of equation x2-3x + M = 0 is a real number___ .
- 20. It is known that the equation (a + b) x ^ 2-2ax + a = 0 about X has two unequal real roots x1, X2, and the parabola y = x ^ 2 - (2a + 1) x + 2a-5 is the same as X axis It is known that the equation (a + 2) x ^ 2-2ax + a = 0 about X has two unequal real roots x1, X2, and the two intersections of the parabola y = x ^ 2 - (2a + 1) x + 2a-5 and the X axis are located on both sides of the point (2,0). (1) find the value range of the real number a; (2) find the value of a when the absolute value of X1 plus the absolute value of X2 is equal to two root signs 2