Find the rule and fill in the numbers. 90,1,75,17,60,33, (), () ()

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• 1. Find the rule: 2 / 3 1 / 2 2 / 5 1 / 3 2 / 7 1 / 4
• 2. 150%, 1,3 / 4,60%, (), (), () fill in the regular number, 150%,1,3/4,60%,（ ）,（ ）,（ ） Fill in the numbers regularly First bracket decimal, second bracket fraction, third bracket percentage
• 3. Find the law
• 4. Fill in the numbers in the first grade of primary school
• 5. Fill in the numbers regularly in grade one 3.4.9.9.15.14. (). 19. ()
• 6. 1： 3-3 () + 1 () - 2 () + 3 () - 1 () 2： 4-1 () + 0 () + 2 () - 1 () + 3 () 3： 2 + 3 () - 1 () - 2 () - 1 () + 3 () 4： 5-1 () - 2 () + 2 () + 1 () - 1 () Ask () what to fill in and what rules to follow
• 7. Primary school to find the rule to fill in the number 6,1,8,3,10,512,7（）（） 15,16,13,19,11,22（）（）7 1/1.3/4,2/3,5/8,3/5,7/12()() 1,3,8,16,27,41()()
• 8. Primary school to find a rule to fill in the number, simple 2 / 5 4 / 5 1.2 one and three fifths () () 1 1/4 1/9 1/16 1/25 （ ） （ ）
• 9. How to find rules and fill in numbers in primary school (super simple) 1,2,3,10,17,（ ）,（ ）
• 10. There is a big circle in the middle, 10 in it, a small circle in the top, 2 in it, two small circles in the bottom, 3 on the left and 5 on the right. There is a big circle in the middle, 30 in it, a small circle in the top, 3 in it, two small circles in the bottom, 5 on the left and 6 on the right. There is a big circle in the middle, 64 in it, 4 in it, two small circles in the bottom and 6 on the left, The last one on the right is 8. The small circle on the top is 5 inside, and the two small circles on the bottom are 9 on the left and 4 on the right. How about the number of the big circle in the middle of the last one
• 11. (- 0.5) - (3 and 1 / 4) + 6.75-5 and 1 / 2,
• 12. 16×（6.75÷512-2.4+414×225）-118-0.875．
• 13. 5 100%, 4 / 3, 0.6
• 14. Find the law: one third, (), five and one-third, twenty-one and one-third
• 15. 11x22+0.22x3300+330x4.4=
• 16. Fill in the blanks according to the rule: 7 & nbsp; & nbsp; & nbsp; 3.5 & nbsp; & nbsp; & nbsp; 1.75______   0.21875．
• 17. Find the rule () 3.5 1.75 () 0.4375
• 18. Fill in the number according to the rule, 0.25, 0.5, 75%, 1 (), (), () how to fill in
• 19. 5, 0. 75, 0. 375, (), ()
• 20. Four children buy a ball together. The first child pays 1 / 3 of the total money paid by other children, and the second child pays 1 / 3 of the total money paid by other children 1 / 4, the third child paid 1 / 5 of the total amount paid by other children, and the four children paid 36.8 yuan. What's the price of this football?