"Calculate the sequence 1,1 + 2 + 1,1 + 2 + 3 + 2 + 1,

n*(n-1)+n

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1. Calculate the sequence, - 1, - 1 + 3, - 1 + 3-5, - 1 + 3-5 + 7 respectively From this, we can guess that: an=-1+3-5+… +The result of (- 1) ^ n (2n-1) is proved by mathematical induction
2. Calculate the value of (2 × 3 × 4 × 5) × (1 / 2 + 1 / 3 + 1 / 4 + 1 / 5) To calculate the value of (2 × 3 × 4 × 5) × (1 / 2 + 1 / 3 + 1 / 4 + 1 / 5), simple calculation is required!
3. How much% d% a is it equal to [2.5:3] + [3.4:1] + [3.5:2] + [+ 2.4:3] + [- 1.2:1] + [+ 1.3:1]
4. Calculate (- 2) ^ 5, (- 3) ^ 5, (- 1 / 2) ^ 5
5. Calculation: - 1 + 2-3 + 4-5 + 6-7
6. 3 / 5 - (1 / 2-1 / 4) 3 / 10 + 1 / 5-1 / 3 3 in 5 - (1 in 2-1 in 4) 3 in 10 + 1 in 5-1 in 3, 8 in 9 - (1 in 6 + 1 in 3)
7. Calculate a ^ 3 * (1 / a) ^ 2
8. What is a ^ 2 + A + 1-A ^ 3 (A-1)?
9. Calculation (a + 1) (a + 2) (a + 3) (a-6)
10. Using two methods to calculate (a + 3) ^ 2 - (A-1) ^ 2
11. 2 + 3 + 4 + 5 +. + n-2 =? How to calculate this sequence?
12. It is known that the image with inverse scale function y = m-5 △ x is in quadrant 2 and quadrant 4, and the value range of TM is in quadrant 2 and quadrant 4
13. If M (A-2, - A + 3) is in the third quadrant, then the value range of a is ()
14. Given that the point m (- 35-p, 3 + P) is the third quadrant, then the value range of P?
15. If the point P (- m, m-1) is in the third quadrant, then the value range of M is_______ . I must reply today
16. Given that the point m (- 35-p, 3 + P) is the point of the third quadrant, then the value range of P is
17. Given that the point m (- 5 + m, - 3) is in the third quadrant, the value range of M is
18. In the plane rectangular coordinate system, if P (2x-6, X-5) is in the fourth quadrant, then the value range of X is () A. 3＜x＜5B. -3＜x＜5C. -5＜x＜3D. -5＜x＜-3
19. If the point P (5, y) is in the fourth quadrant, then the value range of Y is () A. y＜0B. y＞0C. y≤0D. y≥0
20. In the plane rectangular coordinate system, if the point P (m, m-2) is in the fourth quadrant, then the value range of M is () A. m＞2B. m＜0C. 0＜m＜2D. 0≤m≤2