How to calculate 125 × 36 + 25 × 18 with simple method

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• 1. 2*4*6*8*10*12*14*16*18*20=? Method
• 2. 2+4+6+8+10+12+14+16+18+20+22+…… +2002
• 3. Observe such a column of data, (2), (4,6), (8,10,12), (14,16,18,20) According to this rule, what group is 2008 in? If you want to say why, you can't count them one by one
• 4. Simple calculation: [5 / 6 - (5 / 12-2 / 5)] 7 / 18
• 5. Simple calculation of 26.64 + 6.37-18.64 + 13.63
• 6. Simple operation of 5 / 6 * 1 / 13 + 5 / 9 * 2 / 13 + 5 / 18 * 6 / 13
• 7. Simple calculation: 18.86-6.27 + 1.14-4.73
• 8. Simple operation of 1-5 / 7 * 21 / 25
• 9. Simple calculation of 36 × 25% + 3.6 × 7.5
• 10. Ask: mathematical calculation problem, one and one-third times three fifths, how to calculate?
• 11. How to use simple method to calculate mathematics 2 + 4 + 6 + ·· + 18 + 20
• 12. 4 and 7 / 16 - (1.26 + 7 / 16) - 0.74
• 13. 3.25 × 0.8-0.8 4 / 7 / 5 2 / 7 × 29 / 7 + 2 / 3 26 25000 × 4.14% × 5
• 14. 76 - [(0.74 + 0.26) divided by 0.8=
• 15. 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
• 16. 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***
• 17. 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□□
• 18. 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
• 19. 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
• 20. Calculation 1 + 3 + 5 + 7 +... + 29-2-4-6 -. - 28