349-12.5 * 418 = 450 △ 25 = 7 / 15 * 2 / 17 + 2 / 15 * 8 / 17 = 9.8 * 50.2 = 5.3 * 2.72= What can be easily calculated should be easily calculated! Here are five separate questions

A 4567

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1. Five out of seventeen times two out of five times two point three
2. What can be easily calculated should be 1 / 4 × 4.6 + 27 / 5 × 25%
3. -Three and seventeen four times two and fifteen two seven and seventeen four times fourteen and fifteen thirteen four times (- fourteen and fifteen thirteen) Come on, in a hurry!
4. 6 × 3 / 4 = 27 / 5 × 4 / 3 = 15 / 2 × 6 / 5 = remember about!
5. 2.5 times two fifths
6. The number of girls in the school sports team is two fifths of the number of boys, and then there are three boys. At this time, the number of girls is one fifth of the number of boys Three eighths, how many people are there in sports now?
7. From the conversation with the doctor, Xiaojiang learned that adults need about 8L oxygen per minute. How many liters of air do adults need per minute? What is the mass of 8L oxygen in standard condition? What is the mass of air required? (oxygen density = 1.429g/l, air density = 1.293g/l)
8. What is 1 / 106:1.69/44:17/18
9. 1-18 / 1 is equal to?
10. 18 / 5 + 10 / 7 + 18 / 13 + 10 / 1 is equal to?
11. 1. Simplification ratio (1) 187cm: 17m (2) 0.25kg: 1g (3) 2 / 5 to 1 / 4 (4) 1.25 to 4.5 2 2. Calculate the ratio (1) 1 / 4: 1 / 5 (2) 18:3 (3) 0.0.001 (4) 0.4KG: 1.2m 3. Calculate the unknown x (1) 3: x = 9:18 (2) 25th x = 0.8 of 125 (3) 3 / 5 x-35% x = 1.25 (4) 25% x + 3 / 2 = 7.5 (5) 3x-120% = 9 / 20 (6) x-20% x = 8 / 5
12. 17.98 + 2.5 * 0.3-18 / 1.5 to be simple
13. 3 1/8÷【（4 5/12－3 13/24)×4/7＋(3 1/18－2 7/12)×1 10/17]=?
14. How to multiply (68-17 / 18) by 1 / 17
15. Simple calculation of 9 out of 17 divided by 7 + 1 out of 7 * 8 out of 17
16. The product of X and 1.5 plus 8.4 is 36 times 0.4
17. 5.46-1.79 + 6.54-8.21 simple calculation 4.71 - (1.6 + 17.1) simple calculation 0.25 × 12.5 × 320 simple calculation I just want to confirm
18. Simple operation of (8700 + 870 + 87) / 87
19. How to calculate 12.43 - (0.42 + 4.36) - 2.64
20. 2.72-3.98 + 5.28-2.02 how easy to calculate!