Ask arithmetic questions 21 ／ one third = (2-three fifths) ／ 14 / 19= 1-2 / 3 × 1 / 3 = (6 / 7 + 1 / 7) × 3 / 8= 9 / 8 × 4 / 25 = 3 / 4 × 2 / 3-1 / 4=

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• 1. The flag has 50 pieces. Party A and Party B take turns to take the pieces. They can take five pieces at most and one at least. If they take the last one, they will win. How many pieces should Party A take first? How can they win later? How many should I take after a? How to win after that?
• 2. A simple algorithm for an arithmetic problem 1 + 1 / 6 + 1 / 12 + 1 / 20 + 1 / 30 + 1 / 42 + 1 / 56 = how much Russia
• 3. Ask a primary school arithmetic problem to use the simplest method (1+0.23+0.34)X(0.23+0,34+0.65)－(1+0.23+0.34+0.65)X(0.23+0.34)=
• 4. What is the simple algorithm of the formula 999 × 778 × 333 × 666?
• 5. Arithmetic problem: the division of Medicine Two pieces of medicine, one piece is divided into three parts, a total of six parts. Now I took one part, and asked: how can I divide the remaining five parts into one of the two parts Correction: it's the amount of each of the remaining five,
• 6. Work out a simple arithmetic problem How much is the factorial of 10 times 3.14, times 999, plus 123 What if it's a factorial of 100?
• 7. Absolute simple arithmetic Isosceles right triangle waist length 10 cm, its area is () square centimeter
• 8. A very simple arithmetic problem: 120-x = 20% X
• 9. The arithmetic problem is very simple. I'm really too lazy to think about it Five and three quarters + three and two thirds + negative four and one fourth + negative six and one third= Five and three quarters + three and two thirds - four and one fourth - six and one third= These two formulas
• 10. A very simple arithmetic problem, -Factorization of square-4y + 4xy of X 2 (a + b) & sup2; + 20 (a + b) + 50 factorization
• 11. Ask some rational arithmetic questions ①-9÷3+（1/2-2/3）×12+3² ② The 99th power of (- 3) × (- 2) - (- 1) △ 1 / 2
• 12. Arithmetic problem! Hurry up 99 times (one minus half) times (one minus one third) times (one minus one fourth) (one minus ninety-nine one) Solve it in an hour! Hurry up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I'm in urgent need on the first day of junior high school, or I'll be killed by chopping ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!!!!!!!!!!! ~~~~~~~~~~~~~~~
• 13. If a & # 178; + AB AB & # 178; = 0, then the value of a / B-B / A-A & # 178; + B & # 178; / AB is?
• 14. Known: A & # 178; + B & # 178; = 1, C & # 178; + D & # 178; = 1, AC + BD = 0, derived AB + BD = 0 Oh, it should be ab + CD = 0
• 15. In △ ABC, if we know that the square of a = 1 / 3, the square of B = 1 / 4, then the angle B =?
• 16. Finding the reduced value of 7a - [3B - (a-2c) - C]
• 17. Simplification: 3b-2c - [- 4A + (c + 3b)] + C
• 18. Given that the unit vector ABC is perpendicular to each other, simplify (2a-2b + 4C) times (- a-3b + 2C)
• 19. Simplification: (a ^ 4-A ^ 2B ^ 2 / A & # 178; - 2Ab + B & # 178;) / (A & # 178; + AB / B & # 178;) × (B & # 178 / / a)
• 20. It is known that the value of the algebraic formula 7 / 3a-11a + 33 / 6 is less than that of the algebraic formula-3a-1 / 5-13-a / 2, and L1-L1 + all is simplified