18: 32 0.25:1.8 12:11:9 22 1.2:4 3 18:32 0.25:1.8 11 out of 12: 22 out of 9 1.2:3 / 4

RELATED INFORMATIONS

• 1. 24（）1.5＝25.5.24（）0.3＝23.7.24（）0.3＝24.3.24（）1.5＝36.24（）1.5＝22.5.24（）0.8＝30. 24 () 0.8 = 23.2 (fill in operation symbol)
• 2. How to calculate 3.8 * 2 + 3.8 * 99
• 3. Simple calculation of 72 × 0.99
• 4. Simple operation of 99 times 26
• 5. 1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + 1 / 32 + 1 / 64 simple operation, write out the specific process
• 6. Simple calculation: 1, 8.32 * 34 + 8.32 * 66 2, 37.5/25 + 62.5/25 3, 7.25-0.68-6.25
• 7. The simple calculation is 37.58 × 97
• 8. 2 out of 7 times () = 3 out of 13 times () = 9 out of 17 + () = 9 out of 7 - () = 1
• 9. A bag contains seven balls of the same size, including three red balls, two black balls and two white balls, Take 2 balls continuously from them (do not put them back after taking them) (1) The probability of getting the red ball for the second time
• 10. 58 / 78 reduction ratio
• 11. Find the nth number 1,4,9,16,25,36
• 12. 1,4,9,16,（）,（）,36,49... 1,1,2,3,5,8( ),21,34...
• 13. (1-1/4)(1-1/9)(1-1/16)(1-1/25)(1-1/36)(1-1/49)=?
• 14. 1 / 4, 5 / 12, 7.9 / 36 Come on! Hold your fist
• 15. What's the ratio of 1-6:5 + 12:7-20:9 + 30:11-42:13 + 56:15-72:17
• 16. Calculation: 3 / 7 * 5 / 13 - (9 / 14-3 / 14) * - 11 / 13) - 3 / 7 * 3 / 13
• 17. How much is 11 and 3 / 14 - (3 / 5 + 2 and 5 / 14)?
• 18. 7 of 15 × () = () × 5 = 0.3 × () = 5 of 6 × () = 8 of 9 × ()
• 19. 8 out of 9 divided by 2, 8 out of 9 divided by 4, 8 out of 9 divided by 8, 2 out of 15 divided by 1, 5 out of 7 divided by 5, 6 out of 11 divided by 3, 21 out of 15 divided by 14
• 20. 1 / 7, 4 / 7, 3 / 8, 3 / 4, 5 / 7, 2 / 7, 3 / 9, 6 / 7, 3 / 5, which are greater than 3 / 7,