Three to one is equal to one-third is equal to several to four, and 0.625 is equal to three-quarters

Three to nine is one third, four to three
625 to 3 / 4 = 5 / 8: 3 / 4 = 5 / 6 = 5 / 6

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1. Simplify the following ratios and calculate the ratio. 3 / 20:3 / 80.625:3 / 40.3:0.18 3/20：3/8 0.625：3/4 0.3：0.18
2. 625, and the ratio is calculated
3. 2: 1 / 3 0.375 20%: 0.6 (1) simplify the following ratio. (2) calculate the ratio
4. 1, calculate the following ratios: 1 / 3:1 / 7 = () 90g: 0.6kg () 2, simplify the following ratios: 3.5:25 = () 3. Dissolve 25 grams of salt into 200 grams of water. The simplest weight ratio of salt to brine is () 4. If the ratio of two numbers is 1 / 4, and the former and latter terms of the ratio are expanded four times at the same time, then the ratio is equal to () 5,3 percentage points is (), 0.5 has () 1%
5. 3:0.250.8:1 and 5:7.4:3:1.25 3:7:4 reduction ratio
6. The result of simplifying (a ^ 2 / A-1) - A-1 is
7. Simplification: a (a + 2) - (A-1) (a + 1) Using the complete square formula to calculate: (-x-y)^2
8. (a + 2) (A-2) - A (a + 1) simplification
9. Reduction ratio: 0.375:3 / 8 Please write the formula, too.
10. 2 / 3 to 1 reduction ratio
11. 3 and 3 / 4 × 73.5-3.75 × 57.3 + 16.2 × 6 and 1 / 4 = simple calculation
12. 9% of 76 × 75 + 8% of 74 × 75 can be calculated simply
13. Simple calculation of 0.375 × 4 and 3 / 8-3 / 8 + 6.625 × 0.375
14. 897 * 3 / 8-0.375 + 104 * 0.375 simple method
15. How to calculate (0.375 * 1.8, 6.3 * 5.4, 2.7, 2.1 * 0.125 * 3.6, prawns Simple calculation
16. 897 * 3 / 8-37.5% + 104 * 0.375 3 1 / 4 * (5 3 / 8-5.375) simple calculation
17. 1: 12.5 * 24 * 0.9 =? (simple calculation)
18. 5.72 - (0.24 × 3 + 1.6) simple calculation
19. What can be calculated simply is 8 / 9 × (5 / 9-1 / 4) × 8 / 11 4 / 9 × (3 / 10-5 / 6 × 3 / 10) 3 / 8 × (3 / 5-1 / 3 × 3 / 10) 4/9×（3/10-5/6×3/10） 3/8×(3/5-1/3×3/10)
20. How to calculate 0.654 + 10.9 * 6.5