A cube is made up of six identical elements______ A three-dimensional figure formed by a circle

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• 1. Have you ever judged how many cubes there are according to the three views of the three-dimensional figure made of several cubes? The more the better!
• 2. A cube is a three-dimensional figure surrounded by six squares. Is it right or wrong? Notice I'm in grade five
• 3. The following table is arranged according to a certain rule. The number 88 in the eighth row of the table is______ ．
• 4. Arrange the natural numbers from 1 to 100 as shown in the following table. In this table, the long side has three numbers and the wide side has two numbers Arrange the natural numbers from 1 to 100 as shown in the table. In this table, surround the three numbers on the long side and the two numbers on the wide side with a rectangular box. The sum of the six numbers is 87. In other parts of the table, the sum of the six numbers enclosed as mentioned above is 429? 1 2 3 4 5 6 7 8 9 （10 11 12 ） 13 14 15 16 （17 18 19 ） 20 21 ......................................... .................................. .............................................97 98 99 100
• 5. Arrange some numbers in the following table: the first column, the second column, the third column, the fourth column, the first row 14510, the second row 481012, the third row 9121514? (2) What are the rows and columns of the number 81? (3) What are the rows and columns of the number 100?
• 6. Observe the number arrangement in the table below. The second number in the nth row (n ≥ 2) is___ ．
• 7. The following is a regular number table, please use the algebraic expression with n to represent the number of n-th row and n-th column in the number table First column second column third column fourth column First line 1 2 5 10 The second line 4 3 6 11 The third line 9 8 7 12 The fourth line 16 15 14 13 .....
• 8. Number reasoning: 2,3,13,45, (), the numbers in brackets are Please provide the calculation process, tks~
• 9. Number reasoning: - 3, - 2, - 1,6,25, (), the number in brackets should be? 58 、62、66、70
• 10. What number should brackets be
• 11. A three-dimensional figure has six small cubes from the top, and six small cubes from the front and side. How many small cubes does this figure form consist of
• 12. The number of cubes in each layer is 1, 3, 6 How many cubes are there in layer N?
• 13. The positive odd numbers 1,3,5,7 Arrange in five columns according to the format shown in the figure. What is the row and column of 2005? The positive odd numbers 1,3,5,7 Arrange in five columns according to the format shown in the figure. What is the row and column of 2007? The positive odd numbers are arranged in 5 columns as follows: First column second column third column fourth column fifth column First line 1 3 5 7 The second line 15 13 11 9 The third line 17 19 21 23 The fourth line 31 29 27 25
• 14. The matrix of Figure 1 is composed of odd numbers Figure 1 1 3 5 7 9 11 13 15 17 19 ………………………… 91 93 95 97 99 5. 7, 13, 15 are framed together (1) Look at the relationship between the four numbers in the box in Figure 1. Please use letters to indicate the relationship between the four numbers in such a box (2) If the sum of the four numbers framed in this way is 200, calculate the four numbers (3) Is there such four numbers whose sum is 400? Why?
• 15. The positive odd numbers 1,3,5,7 Arrange in five columns according to the format shown in the figure. What is the row and column of 2007? One column, two columns, three columns, four columns and five columns One line 1 3 5 7 Second line 15 13 11 9 Sanxing 17 19 21 23 Four lines 31 29 27 25 Five elements 33 35 37 39 … In which row and which column is 2009
• 16. As shown in the figure below, arrange the number in a column according to the rule in the figure, then the number to be filled in the question mark is? What's the next number? Why?
• 17. There is a column of numbers: 2, 1, 1, 2. The rule is: from the second number, three times of each number is equal to the sum of the two numbers before and after it Can the 1000th number be divided by 2? How many times is the 1000th number divided by 3?
• 18. Give two column numbers: 1, 3, 5, 7, 9 , 2001 and 1, 6, 11, 16, 21 In 2001, the number of numbers appearing in the two books at the same time is A 199 B 200 C 201 D 202
• 19. The sum of 15 consecutive odd numbers equals 2001. What is the largest odd number?
• 20. There is a column number: 1, 2, 5, 13 Starting from the second, three times of each number is exactly equal to the sum of the two numbers on its left and right sides, and find whether the number 2009 is odd or even