Calculation: (3 × 10-5) 2 △ (3 × 10-1) 2

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• 1. ① Calculation [1 / (1 × 2)] + [1 / (2 × 3)] + [1 / (3 × 4)] + ＋[1／（10×11）]. ② Using the thinking of the above question to calculate: {1 / [a (a + 1)]} + {1 / [(a + 1) (a + 2)]} + {1 / [(a + 2) (a + 3)]} + +The value of {1 / [(a + 2008) (a + 2009)]} + {1 / [(a + 2009) (a + 2010)]}
• 2. 8 x (- 2) x (- 4) x 1 x (- 3) calculation
• 3. Calculation: (1 + 10 / 1 × 1) + (1 + 10 / 1 × 2) + (1 + 10 / 1 × 3) + +(1 + 10 / 1 × 9) + (1 + 10 / 1 × 10)
• 4. Calculation: (1 -?) 2 (1-1 / 3) 2 (1-1 / 4) 2 ×. (1-1 / 10) 2 What was the result? It's better to explain the calculation method as well Is the square of (1-1 / 2), the square of (1-1 / 3), the square of X (1-1 / 4), and the square of X (1-1 / 10)
• 5. Skillful calculation of Mathematics one thousand two hundred and thirteen
• 6. 9.1 + 9.2 + 9.3 + 9.4 + 9.1 + 8.9 + 8.8 (clever calculation)
• 7. 1 × 2 / 1 + 2 × 3 / 1 + 3 × 4 / 1 + 4 × 5 / 1 + 5 × 6 / 1
• 8. Ingenious calculation: (1 / 2 + 1 / 3) - (1 / 3 + 1 / 4) + (1 / 4 + 1 / 5) - (1 / 5-1 / 6) - (1 / 6)+ Clever calculation: （1/2+1/3）-（1/3+1/4）+（1/4+1/5）-（1/5-1/6）-（1/6+1/7）-(1/7+1/8)
• 9. 15 16 17 18 19 20 six numbers are filled in () of the three sides of the triangle so that the sum of the three numbers on each side is 51
• 10. (1) 15 of a number is 3.6 less than 1.6 times of 4.5. Find this number. (2) what is the difference between 6 divided by 67 and 6 divided by 67?
• 11. Calculate 1 + 2 + 2 ^ 2 + 2 ^ 3 + 2 ^ 4 +. 2 ^ 63
• 12. 1 / 2 - (2 / 3-1 / 4)
• 13. Using two methods to calculate (a + 3) ^ 2 - (A-1) ^ 2
• 14. Calculation (a + 1) (a + 2) (a + 3) (a-6)
• 15. What is a ^ 2 + A + 1-A ^ 3 (A-1)?
• 16. Calculate a ^ 3 * (1 / a) ^ 2
• 17. 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)
• 18. Calculation: - 1 + 2-3 + 4-5 + 6-7
• 19. Calculate (- 2) ^ 5, (- 3) ^ 5, (- 1 / 2) ^ 5
• 20. 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]