How to calculate 25 × 17 × (4 × 13) recurrence equation skillfully

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• 1. [17.45 - (5.13 + 7.07) * 0.25] [0.24 recursive equation calculation! Step by step!
• 2. What is the product of the reciprocal of 8 / 9 and the reciprocal of 3 / 4?
• 3. 9+9x9= ( )+( )x9=900000 18+98x9= （ ）+（ ）x9=9000000 117+987x9= ( )+( )x9=90000000 Find the law
• 4. If you can make a simple calculation, you can make a simple calculation
• 5. Can we choose seven of these nine numbers so that the sum is 50? 1, 3, 5, 7, 7, 9, 11, 15, 21
• 6. 3.6×2.7+18×0.56-1.8×10%÷l0%
• 7. This is the formula of grade five in primary school. Can you do it? A simple method of 10.1 × 0.99
• 8. 0.25 × 1.8 + 3.9 (simple calculation)
• 9. Simple calculation of 42 + 98 × 21
• 10. Fractional division: 48 * (1 / 2 + 1 / 3 + 1 / 12) 53 * 52 / 19 8 / 9 * 9 / 8 (25 + 1 / 5) / 5 (7 / 49-9) / 7 (2 / 7 + 6 / 13) * 17 * 13 (4 / 5-1 / 3) * 6 * 10 100 points for correct answers
• 11. 1. Today is Saturday. What day will it be in 1000 days?
• 12. 7 / 11 - (2 / 5-4 / 11) simple calculation
• 13. 6.72-3.28-1.72 = how much
• 14. The simple calculation is 2.78 * 4.9 + 0.49 * 72.2,
• 15. 7 out of 13 + 16 out of 9 + 6 out of 13 - 8 out of 9,
• 16. Algorithm of 1 / 2 × 2 / 3 × 3 / 4 × 4 / 5 × 5 / 6 ×. × 47 / 48 × 48 / 49 × 49 / 50 It's all right
• 17. 1 / 2 + 1 / 2 * 3 + 1 / 3 * 4 + 1 / 4 * 5 + 1 / 5 * 6 + 1 / 6 * 7 + 1 / 7 * 8 + 1 / 8 * 9 + 1 / 9 * 10
• 18. Regular questions 2 / 3, 4 / 15, 6 / 35, 8 / 63, How do you calculate that
• 19. 9 8 7 6 5 4 3 2 1=2001 You can arbitrarily add +, -, *, / and (), but you can't combine two numbers into one number (such as 1, 2, changing into 12). You can arbitrarily add +, -, *, / and (), but you can't combine two numbers into one number (such as 9, 8, changing into 98), and you can't move one number! You can arbitrarily add +, -, *, / and (), but you can't combine two numbers into one number (such as 9 to 98), and you can't move a number!
• 20. 1：4812-943+131 2：16.28+5.395-1.18-4.305