0.25% 7.8% 40 minus 78 Simple operation

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• 1. 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
• 2. 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
• 3. 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!
• 4. 0.25 = 1 / 4 = 2 / 8 = 5 divided by () = divided by 40
• 5. () / 8 = 40% () = 0.5 = () percent = (): ()
• 6. 1 / 5 × 8 + 0.6 × 0.2 + 1 / 5 × 40%
• 7. 5 / 8 of 40 is () () 5 / 8 of () is 40
• 8. () 8 = () 40 = 0.5 = (): () = () discount
• 9. Simple calculation of 6 and 4 / 7-2 and 1 / 8 + 17 / 7-0.875
• 10. -875 - (- 1 and 1 / 4) + 3 / 4 + 1 and 7 / 8 (calculation)
• 11. ③ (6 / 5 - 1 / 2 + 1 / 3) × - 6
• 12. 675 = (): 8 = () 40
• 13. 0.8 40% more than ()
• 14. 40÷（）=（）：20=0.8=（）%
• 15. 7 / 8 △ 56.34 + 0.00875 △ -0.5634 process
• 16. Fill in the blank; 0.625 = [% 5] = 40 △ [] = [%]
• 17. Find the rule 15.625 () 2.51 () 0.16 15.625( )2.5 1( )0.16
• 18. How to simplify the ratio of 0.625 to 1
• 19. 625 to 1
• 20. 7 / 8 times (x-3 / 7) / 0.625 + 0.2 = 1