Five simple problems (1) 2 + 4 and 2 / 9-5 and 3 / 7 (2) 9 5 / 6 * 4.25 + 4 1 / 4 / 6 (3) (3 5 / 12-1 3 / 7) - (1 4 / 7-1 7 / 12) (4) 16 4 / 5 + (2 4 / 7-1.8) （5）（111+999）/【56*（3/7-3/8】 Because I can't write with scores, I have to write it in the form of several times,

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• 1. 【1】1/5×3/4+1/4 【2】（1/6+1/8）×24×1/7 【3】 5/19÷5/7-1/19÷2/7 【4】11/12÷【（3/5+1/3）×5/7】 There must be operational symbols.
• 2. Please help me to solve some math problems -99 and 97 / 98 * (- 98) - 5 * (- 11 / 5) + 13 * (- 11 / 5) - 3 * (- 11 / 5)
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• 5. It's 9:2001, 2000 × 1949 and 24 × 43:51 + 51 × 43:19. I can't type it. Please write it on the title paper according to my words and think about it It's all about simple calculation
• 6. There is a simple problem, please help me to do 4 / 5 + 9 and 4 / 5 + 99 and 4 / 5 + 999 and 4 / 5 + 9999 and 4 / 5
• 7. 11*11*11-11*11-10= 36*1111+8888*8=
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• 13. Simple calculation for Grade 6 of primary school （1）3/5+2/5÷4/5+1/5 （2）1-1/3÷3/5-1/9 （3）（1/6+1/4）×8+2/3 （4）5/9-4/9÷8/9+1/9 （5）1/4+（1/18+1/8）×6 （6）（1/6+2/9）÷2/3+3/4
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• 19. Observe the following three lines: 0, 3, 8, 15, 24 ①2，5，10，17，26，… ②0，6，16，30，48，… ③ (1) what is the rule of the number of the first line? (2) What is the relationship between the number of rows 2 and 3 and the number of rows 1? (3) Take the seventh number in each row and find the sum of the three numbers
• 20. Calculation by formula: 3.2 (0.25 + 17 / 6) 12.5 / 5 / 3 + 9 / 64 Calculation by formula: 3.2 (0.25 + 17 / 6) 12.5 / 5 / 3 + 9 / 64