Simple calculation of 3 / 2 * 4 / 3 * 5 / 4 * 6 / 5 *. * 10 / 9

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• 1. (1+1/2)*(1+1/4)*(1+1/5)*…… *(1+1/10)*(1-1/3)*(1-1/5)*(1-1/6)*…… *(1-1 / 9) how to calculate easily?
• 2. ① 4 / 15 (1 and 4 / 9-3 / 2 × 5 / 6) + 5 / 6) + 5 / 6 ② 1:5 and 1:4 (1:2 × 1:3 + (1:8-1:4))
• 3. 5 / 7 + 5 / 6 + 2 / 7 + 1 / 6 = 1 / 15 * (1 / 3 + 1 / 12) 1 / 4 / (3-5 / 13-8 / 13) 4 / 9 / [5 / 6 - (1 / 6 + 1 / 3)] It's a process
• 4. 1 * 3 * 5 + 2 * 6 * 10 + 3 * 9 * 15 =? (simple operation)
• 5. 45 × (7 / 9 + 4 / 15-3 / 5)
• 6. Calculation: 1 × 2 × 3 + 3 × 6 × 9 + 5 × 10 × 15 + 7 × 14 × 211 × 3 × 5 + 3 × 9 × 15 + 5 × 15 × 25 + 7 × 21 × 35=______ ．
• 7. (50/9-0.8+22/9)×(7.6÷4/5+12/5×1. In the equation (13.5-35 / 4-19 / 4) / [11 / 2 × (△ 23 / 14) / [11 / 7] = 1 / 30, find the number represented by △
• 8. (- 1 / 7) + (- 2 / 5) + 7 / 9 + (+ 1 / 7) + (- 3 / 5) simple calculation process (- 1 / 7) + (- 2 / 5) + 7 / 9 + (+ 1 / 7) + (- 3 / 5) simple calculation process Simple calculation process of 3 / 7 × (- 1 / 5) + 3 / 7 × (- 4 / 5) - 3 / 7 × 3 / 10
• 9. The ratio of simplification is 0.6:0.12 32:50, 4 / 3: 1.6, 7 / 5: 28 / 15
• 10. How to calculate 46.3-19.9
• 11. 1/1×3+1/3×5+…… +1 / 9 × 11 = simple operation
• 12. 8.9 plus 3.2 minus 8.9 plus 3.2
• 13. Calculation: 98 ° 12 ′ 25 ″ 5
• 14. Calculation: 50 ° 24 ′× 3 + 98 ° 12 ′ 25 ″ 5=______ ．
• 15. 2.25 + 3 and 1 / 8-2 and 3 / 4 + 1.875 calculation process
• 16. The value of minus four minus twelve minus one ninth plus four minus one third
• 17. 5 / 6:1 simplification
• 18. 6 / 5:6 / 1 simplification
• 19. How to simplify one out of seven 7/1/3
• 20. The ratio of simplification is 1:1 / 7 1: One in seven 1：0. dial the wrong number It's 1:0.3