Put eight numbers 123456789 in the square, so that the sum of three numbers on each line is equal to 15 No 9 sorry

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• 1. 123456789 number position does not move. With the addition and subtraction method plus brackets, finally equal to 2
• 2. Here is another symmetrical equation, but one of the numbers is not written out, and is replaced by a bracket: 12 × 46 () = () 64 × 21 () Here is another symmetrical equation, but one of the numbers is not written out and is replaced by a bracket: 12×46（）=（）64×21 What is the number of () in the formula? Can you work it out with the equation?
• 3. The sum of a two digit one digit number and a ten digit number is greater than 10. If 36 is added to the two digits, it is exactly equal to the two digits after the exchange of two digits, Find the original two-digit number, with one-dimensional inequality
• 4. The result of the addition and subtraction of four numbers is 24 3,4,-6,10, 3,-5,7,-13 Write three different calculation methods for each group of numbers
• 5. Six out of seven / five out of nine * equals seven out of eight
• 6. 1 2 3 4 5 6 7 8 9 10 = 2014 with addition, subtraction, multiplication, division of brackets, etc. without changing the numerical order, it is equal to 2014
• 7. Choose + - x division or bracket to write 1,2,7,9 into a formula, the result is 24, the formula is?
• 8. What is (x ^ n-1) ^ 2 (- 3 ^ 3) (- x ^ n) equal to?
• 9. The solution set of inequality 2 Λ X - (3 / x) + 1 ≤ 1 / 2 is 2∧[x－﹙3／x﹚＋1]≤1／2
• 10. 2*4/1+6*8/1+… +2006*2008/1+4*6/1+8*10/1+… What is 2004 * 2006 / 1
• 11. In the 3 * 3 square, fill in the appropriate number so that the sum of the three numbers on the column, row and two diagonals is equal, and the sum of the nine numbers is equal to 54 Three numbers have been given: 13 in the first row, the second cell, 6 in the next cell, and 1 in the last row, the first cell: 13 six one
• 12. 1-8, 8 numbers are filled in the square, so that the number of each side is equal to 13
• 13. 1-9 nine non duplicate numbers are filled in [] [] *] =] [] [] *] =] [] [] Make sure that it's original. Here is the empty one. It's two formulas with nine different numbers. Thank you for your work. There's another division to get rid of, () () / () = (), () / () = （）（）/（）
• 14. () × () = () () = () × () () () fill in 1 ~ 9 numbers, which cannot be repeated
• 15. There are +. -. × in the number composition square of 123456789 [each number cannot be repeated] □－□＝□ × □ ÷ □＝□ ＝ □＋□＝□
• 16. Fill in the number of 1-9 without repetition in the box □ × □ = □, □ + □ - □ = □
• 17. Can the recursive equation 14.7 × 0.56-5.7 × 0.56 + 5.6 be calculated skillfully? If so, please list the formula
• 18. 1-8, fill in the box with 8 numbers, so that the sum of each side is equal to 15
• 19. Vertical and horizontal nine grid, so that the horizontal, vertical, oblique addition is equal to a sum, can not be repeated Nine numbers from 1 to 9
• 20. Fill in 2,4,6,8 in the appropriate box according to the requirements, and only fill in one number in each box without repetition. Thank you very much