Simple calculation 1 + 2-3 + 4 + 5-6 ellipsis + 28 + 29-30 =?

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• 1. Calculation 1 + 3 + 5 + 7 +... + 29-2-4-6 -. - 28
• 2. Number nine palace * 7 * * 15 * * 4 * * 3 * 1 * 9 * * 3 * * 6 * 8 * * 6 * 3 * * 2 * 6 * * 9 * 8 * * 1 * 8 * * 4 * 1 * * 6 * * 9 * 9 * 2 * * 4 * * 48 * * 2
• 3. Jiugongge-12-34-56-78-9 Fill in the box with - 12 - 34 - 56 - 78 - 9 so that the three numbers on each diagonal line in each row and column meet the requirements (1) The product of three numbers is negative (2) The sum of the absolute values of three numbers is equal
• 4. Red scarf happy Sudoku answer (Jiugongge) □ □ 4 □ □ □ □ 37 □ □ 1 □ □ 2 □ 8 □ □ □ □ 6 □ 3 □ 7 □ □ □ 9 □ 7 □ 3 □ 1 □ 6 □ □ □ 6 From above □□□5□□ □8□4□5□3□ 4□□□1□□□2 □□□8□9□□3 □32□□□1□□
• 5. Answer: 28 1 3 7 4 1 3 8 7 6 2 5 8 4 9 8 5 9 6 7 4 9 3 5 81 Jiugong grid: ***2**8** *1*3***7* **41**3** 8**47**6* *2*5***8* *4*98***5 **5**96** *7***4*9* **3**5***
• 6. Use 1, 2, 3, 4, 5, 6, 7, 8 and 9 to fill in the nine palace grid, so that the number of horizontal, vertical and diagonal lines is 16 If not, it's OK
• 7. 76 - [(0.74 + 0.26) divided by 0.8=
• 8. 3.25 × 0.8-0.8 4 / 7 / 5 2 / 7 × 29 / 7 + 2 / 3 26 25000 × 4.14% × 5
• 9. 4 and 7 / 16 - (1.26 + 7 / 16) - 0.74
• 10. How to use simple method to calculate mathematics 2 + 4 + 6 + ·· + 18 + 20
• 11. 1+2-3+4+5-6+7+8-9+10+… +28+29-30=______ ．
• 12. 1+2-3+4+5-6+7+8-9+...+28+29-30=
• 13. Simple calculation: 0.5 × 1.25 × 2 × 8 × 11
• 14. How to calculate 2.5 * 8.74 * 1.25 * 0.4 * 0.8
• 15. How to calculate 17.17-6.8-3.8-3.2, how to calculate 17.17-6.17-6.8-8-3.8-3.2; & amp & nbsp; & nbsp; & nbsp & nbsp; & nbsp & nbsp & nbsp; & nbsp; & & nbsp & nbsp & nbsp; & & nbsp; & & nbsp & nbsp & nbsp; & & nbsp; & & nbsp & nbsp & nbsp; & & nbsp; & nbsp; & & nbsp; & amp & amp & nbsp & nbsp; & & nbsp; & & nbsp & amp & amp & amp & nbsp & amp & amp & nbsp & amp & nbsp & amp & amp & nbsp & amp & amp & nbsp; & & nbsp & amp & amp & amp & nbsp & nbsp & nbsp & amp & nbsp & nbsp & amp & amp & nbsp & nbsp & nbsp & nbsp & nbsp & amp & amp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp; & & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;       2.74×9.5+5×0.274．
• 16. Simple calculation of 5.74 * 1.8-0.2de
• 17. Simple calculation of 5.26 + 3.43 + 0.74
• 18. 2.74 + 12.6 + 7.4 + 3.26 = simple calculation
• 19. 365-26-74 simple operation
• 20. 3.17-2.74+4.7+5.29-0.26+6.3