Find the rule () 3.5 1.75 () 0.4375

7 0.875

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1. Fill in the blanks according to the rule: 7 & nbsp; & nbsp; & nbsp; 3.5 & nbsp; & nbsp; & nbsp; 1.75______ 0.21875．
2. 11x22+0.22x3300+330x4.4=
3. Find the law: one third, (), five and one-third, twenty-one and one-third
4. 5 100%, 4 / 3, 0.6
5. 16×（6.75÷512-2.4+414×225）-118-0.875．
6. (- 0.5) - (3 and 1 / 4) + 6.75-5 and 1 / 2,
7. Find the rule and fill in the numbers. 90,1,75,17,60,33, (), () ()
8. Find the rule: 2 / 3 1 / 2 2 / 5 1 / 3 2 / 7 1 / 4
9. 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
10. Find the law
11. Fill in the number according to the rule, 0.25, 0.5, 75%, 1 (), (), () how to fill in
12. 5, 0. 75, 0. 375, (), ()
13. 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?
14. 1,3,8,21,55 () () fill in the numbers according to the rules. How can the third grade explain to the children
15. Fill in the number according to the rule: 1, 4, 9, 16, 25______ ，49，64．
16. How to fill in 3 / 4 1 / 2 1 / 3 () 4 / 27 (),
17. Fill in the appropriate number according to the rule______ ，______ ②1，3，7，15，31，______ ，127，255③1，1，3，7，13，______ ，______ ．
18. Fill in the numbers according to the rules: 2 and 1 / 4, 3 and 1 / 9, 5 and 2 / 16, 7 and 3 / 25, 11 and 5 / 36, 13 and 8 / 49, () /?
19. Find the law, 1,1,2,3,5,8,13, find the next five numbers
20. 19 36 9 68 4 84 () () find the rule and fill in two numbers after it