The ratio of simplification is 1,2,2:12,2:1,2:3,1:5 3. 1.2:6:2 of 25 and 2 of 5 As long as the answer, not the process Thank you

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• 1. Simplify the following 7:54:21 0.25:0.75 2:4 1.5:90 4:8 1.5cm:5km
• 2. 8 points 5:4 reduction ratio
• 3. Simplification ratio: 6.8 out of 2.4=
• 4. 49.5 x 3 / 5 - (50-1 / 2) x 3 / 5 can be calculated simply!
• 5. Simple calculation of 231 + 229 + 233
• 6. Simple calculation of 765 △ 14 And 756 △ 14
• 7. 765-254 + 135-245 is the simplest
• 8. Decompose the following numbers into prime factors by short division
• 9. To decompose 36 into prime factors, the correct one is () A. 36=4×9B. 36=3×4×3C. 36=6×6D. 36=2×2×3×3
• 10. How to decompose the prime factor
• 11. 50 cm: 1 / 4 4.5 DM: 90 cm 4 hours: 1 / 4 4.5 DM: 90 cm 4 hours: 1 / 4 4.5 DM: 90 cm 4 hours: 1 / 4 hours
• 12. 12.56:3.14 reduction ratio
• 13. -(- 16) how to simplify symbols? And - (+ 20) + (+ 50)
• 14. Simple calculation of (32 × 75 × 12) / (15 × 24 × 8)
• 15. 24 to 8 to 12
• 16. 75 to 1
• 17. Two two digit numbers are different from each other, for example: 12 * 63 = 21 * 36
• 18. Reduce the score to 3 / 6, 15 / 20, 8 / 21, 36 / 72, 42 / 35
• 19. According to 9 out of 5, 16 out of 12, 25 out of 21, 36 out of 32, what is the nth one, which is denoted by letter N (≥ 1)
• 20. Balmer, a Swiss middle school teacher, has successfully extracted spectral data from 9 / 5, 16 / 12, 25 / 21, () 49 / 45, 94 / 60, 81 / 77 What's in the middle What is the law