1 / 2 - (2 / 3-1 / 4)
=1/2-(8/12-3/12)=1/2-5/12=6/12-5/12=1/12
RELATED INFORMATIONS
- 1. Calculate 1 + 2 + 2 ^ 2 + 2 ^ 3 + 2 ^ 4 +. 2 ^ 63
- 2. Calculation: (3 × 10-5) 2 △ (3 × 10-1) 2
- 3. 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)]}
- 4. 8 x (- 2) x (- 4) x 1 x (- 3) calculation
- 5. Calculation: (1 + 10 / 1 × 1) + (1 + 10 / 1 × 2) + (1 + 10 / 1 × 3) + +(1 + 10 / 1 × 9) + (1 + 10 / 1 × 10)
- 6. 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)
- 7. Skillful calculation of Mathematics one thousand two hundred and thirteen
- 8. 9.1 + 9.2 + 9.3 + 9.4 + 9.1 + 8.9 + 8.8 (clever calculation)
- 9. 1 × 2 / 1 + 2 × 3 / 1 + 3 × 4 / 1 + 4 × 5 / 1 + 5 × 6 / 1
- 10. 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)
- 11. Using two methods to calculate (a + 3) ^ 2 - (A-1) ^ 2
- 12. Calculation (a + 1) (a + 2) (a + 3) (a-6)
- 13. What is a ^ 2 + A + 1-A ^ 3 (A-1)?
- 14. Calculate a ^ 3 * (1 / a) ^ 2
- 15. 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)
- 16. Calculation: - 1 + 2-3 + 4-5 + 6-7
- 17. Calculate (- 2) ^ 5, (- 3) ^ 5, (- 1 / 2) ^ 5
- 18. 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]
- 19. 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!
- 20. 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