The Mid-Autumn Festival arrived, and the class bought a box of moon cakes and distributed them to the students. 1 students took 1 moon cakes and 1/9 surplus moon cakes, the second student took two moon cakes and 1/9 surplus moon cakes, the third student took three moon cakes and 1/9 surplus moon cakes, and the fourth student took four moon cakes and/. How many students are there in the class? ( )

A.4 B.6 C.8

Guess and practice.

The first group:

1. Work together. 2. The responsibilities of the referee. 3. Approve regulations. 4. Spring elasticity

5. Everyone has money. 6. Pull a condom. 7. Take the initiative to fight for it. 8. Wait for orders

9. Fiscal deficit 10. Forged account number 1 1. Get to the bottom of it 12. Get ready for the game.

13. Exchange Stadium 14. Warm-up match 15. Team competition 16. Shouting at each other.

17. Mid-Autumn Moon 18. Pingyuan Railway 19. Genuine 20. String tuning

Answer:

1. Axiom 2. Theorem 3. The fourth law. Limited 5. Infinite 6. Greater than the symbol 7. Not equal to 8. Equal sign 9. Negative number 10. Irrational number 1 1. Find the root 12. Equal to greater than 13.

The second group:

1. Broken yarn joint (punching is a mathematical term)

2. Looking up at the moon is just the eighth day (make a trigonometric function name)

3. A debt (with a mathematical noun)

4. Two cows fight (with a mathematical noun)

5. Big sale (using a mathematical name)

6. Goodbye, Mom (type a math noun)

7. The doctor raised his pen (typed a mathematical noun)

8.99 (playing an idiom)

9. 1 10 (to use an idiom)

10. 103 and 1002 (to make an idiom)

1 1.

12. Keep neck and neck (encounter a mathematical term)

13. Go round and round (type a mathematical noun)

14. Don't cheat in the exam (use a math noun)

15. Between Xia and Zhou Dynasties (with a mathematical noun)

16. Street (A mathematical term)

17. abacus beads (hit a mathematical noun)

18. Charter of the United Nations (marked with a mathematical term)

19. Double Ninth Festival, Double Ninth Festival today (use a mathematical noun)

Answer:

1. extension line; 2. Sine; 3. negative numbers; 4. Relative vertex angle; 5. Absolute value; 6. numerator denominator; 7. Prescription; 8. Nothing is true; 9. unchanged; 10. ever changing; 1 1. approximate value; 12. Parallel; 13. Cycle; 14. True score; 15. Shang; 16. Diameter; 17. Algebra; 18. greatest common divisor; 19. Cycle part.