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Mathematics problem 53 Calculate with recursive equation 1.15/4*12/5-12/5/120% 2.100.1-（2.625+0.425）*30 3.99/{23/4-（9/5+21/5*2/7）} 4.（1/4+3/8）/（1-3/10）
1.15/4 * 12 / 5-12 / 5 / 120% = 9-2 = 72.100.1 - (2.625 + 0.425) * 30 = 100.1-3.05 * 30 = 100.1-91.5 = 8.63.99 / {23 / 4 - (9 / 5 + 21 / 5 * 2 / 7)} = 99 / [23 / 4-3] = 99 / 11 / 4] = 364. (1 / 4 + 3 / 8) / (1-3 / 10) = 5 / 8 / (7 / 10) = 25 / 2
It takes nine minutes for a piece of wood to be sawn into four sections. It takes nine minutes for a piece of wood to be sawn into six sections______ Minutes
4-1 = 3 (Times), 9 △ 3 = 3 (minutes), 6-1 = 5 (Times), 3 × 5 = 15 (minutes). A: if it takes 15 minutes to saw 6 segments, the answer is: 15
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- 8. Xiao Hua divided a number by 67 and calculated it by 67. The result is 15. What's the correct answer?
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- 13. A and B set out from a and B at the same time and walk towards each other. A walks 5km per hour and B walks 3km per hour. If they meet at 2km from the midpoint of a and B, the distance between a and B is () km
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- 16. 100 points for a simple math problem! Nail a 2 cm thick wooden box with 1 m long, 60 cm wide and 50 cm high outside. What's the volume of this wooden box?
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- 18. A math problem is worth 100 points When a ship sails between a and B, it takes 3 hours to go downstream and 30 minutes more to go upstream than it does downstream. It is known that the speed of the ship in still water is 26 kilometers per hour. Find the speed of the current and the distance between a and B
- 19. How to calculate 49999 + 4999 + 1999 + 499 + 49 + 5? How to calculate 382-98? Another one: (215 + 357 + 429 + 581 + 625) - 205 + 347 + 419 + 571 + 615) is also simple!
- 20. How to calculate 49999 + 4999 + 499 + 49 with simple calculation? There's another one: 1 + 2 + 3 + 4. There must be one tomorrow! For example, 596-196-153-47 =596-(169+153+47) =569-369 =200