Find the rule 15.625 () 2.51 () 0.16 15.625( )2.5 1( )0.16

The first consideration of this kind of sequence is equal ratio or equal difference sequence
This kind has the decimal point, the change has the big kind, considers the equal ratio sequence
Obviously this is an equal ratio sequence
The first is 6.25 and the second is 0.4

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1. Fill in the blank; 0.625 = [% 5] = 40 △ [] = [%]
2. 7 / 8 △ 56.34 + 0.00875 △ -0.5634 process
3. 40÷（）=（）：20=0.8=（）%
4. 0.8 40% more than ()
5. 675 = (): 8 = () 40
6. ③ (6 / 5 - 1 / 2 + 1 / 3) × - 6
7. 0.25% 7.8% 40 minus 78 Simple operation
8. 25 is 40 (); 18 is 12 (). 5 / 8 tons is less than 0.75 tons（ 25 is 40 (); 18 is 12 (). 5 / 8 tons is less than 0.75 tons (); 0.75 tons is more than 5 / 8 tons () The number of white rabbits is known to be 45% of that of grey rabbits, so the number of white rabbits is ()% less than that of grey rabbits
9. 4.52+5.48+0.25×40 8.4×（0.125+0.1÷0.8） Only change the above operation symbol, the result is 0
10. How to calculate 40 1.25 times 40 0.8 1.25*1.25*…… *1.25*0.8*0.8*…… 0.8=? (40) (40) Urgent! Help me 1!
11. How to simplify the ratio of 0.625 to 1
12. 625 to 1
13. 7 / 8 times (x-3 / 7) / 0.625 + 0.2 = 1
14. (+ 2.75) times (- 8 / 11) times (+ 4 / 13) times (- 1.625)
15. Like 8 × 8 = 64, 7 × 9 = 63, 25 × 25 = 625, 24 × 26 = 624, what rules do you find Narrate with language and express the law of this with algebraic formula
16. 8,1,0.25,37.5%, (), 0.625,57%, (), 1
17. What kind of numbers do you fill in the brackets to make the calculation simple? 0.25 * 4.8 + () * 4.8
18. Fill in the brackets with the appropriate number (simplification required) 0.8 = 0.68 = 0.13 = 0.325 = 0.475 = 1.625 = 1.2 = 1.4 = 2.5=
19. Fill in the brackets with the appropriate number 8 / 8 () = 0.25 = () 4 / 8 = 3 △ () = ()%
20. Simple calculation process of 35 * (3 / 35-2 / 53) * 53