Fill in the numbers regularly______ ，12．

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• 1. Find the rule and add the number 3,9,17,19,（
• 2. Find the rule and add the number 1,8,27,（ ）,125,216,. There are also 12 / () = 0.75 = 24 / 24 () = (); 4 = ()% as required, so that their greatest common factor is 1 1. Both books are prime numbers; () and () 2. Both books are composite numbers; () and (). 3 are prime numbers and composite numbers; () and ()
• 3. 2 / 3,1 has 1 / 3,2,1 has 2 / 3,3 has 1 / 3,4, (), () find the difference between the 100th and 50th numbers
• 4. Find the law, 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26. The ninth number is Fast
• 5. Find the rule, 16,3.8,9,4. {}, {}. What's in the brackets
• 6. How to fill in the brackets?
• 7. Fill in the blanks: 1,1,2,3,7,16,65_ ,4546,……
• 8. ,13,37,109,（ ）,（ ）
• 9. 16,23,9,30,2, () to find the law needs method
• 10. 3＋5＋7＋9… ＋（2n－1）＋（2n＋1）＝
• 11. 1,3,7,13,21,31,43,57,
• 12. A watermelon, mom ate 3 / 8, dad and I ate 2 / 8 of this watermelon. Has this watermelon finished
• 13. Xiaoming ate one third of a watermelon, one sixth less than his father. His father ate this watermelon
• 14. Divide 2 kg into 5 parts on average, each part is a few parts of a kilogram, each part is a few parts of a kilogram, each part is a few parts of a kilogram
• 15. Divide a cake equally into four parts, which means that three-thirds of the cake is three out of four?
• 16. Divide a circle into four parts equally. Each part is a quarter of it. Write 1 / 4. Such three parts are () and 1 / 4 is its ()
• 17. How many parts of a watermelon are given to two people on average
• 18. A 5kg watermelon is eaten by 7 people. How many parts of this melon does each person eat on average? How many kilos?
• 19. Divide 3 / 4 of a cake into 5 parts. How many parts of the cake are each? How many parts of the cake are three?
• 20. Give five watermelons to eight children equally. How many watermelons does each child share? How many watermelons does each child share