1. Calculate with a simple method:
2. In a factory, the output in March is 20% higher than that in February, and that in February is 20% higher than that in 1 month, so the output in March is _ _ _ _ _ _ _ _% higher than that in 1 month.
3. Formula:
The result of (121+122+…+170)-(41+42+…+98) is _ _ _ (fill in odd or even numbers).
There are 40 kilograms of water in two barrels. If you pour 7 kilograms of water from the first bucket into the second bucket, the water in the two buckets is the same, so there is _ _ _ _ kilograms of water in the first bucket.
5.20 Table tennis players take part in the singles competition, and if they are eliminated in pairs, the champion will be decided, and one * * * will play _ _ _ _.
6. Every six-digit number is different. The leftmost number is 3, which is divisible by 1 1. The smallest of these six numbers is _ _ _ _.
7. There are many small circles in a great circle with a circumference of 20 cm, and the centers of these small circles are all on a diameter of the great circle. Then the sum of the perimeters of the small circle is _ _ _ _ cm.
8. In a math contest, there are 10 test questions * * *, 8 points will be deducted for each correct answer and 5 points will be deducted for each wrong answer. Xiaoyu finally scored 465,438+0, and he did _ _ _ _ _.
9. Add+,-,×, ⊙ () between the following 16 sixes to make the following formula hold:
6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6= 1997
Second, answer questions:
1. How many triangles are there in the diagram?
2. The meeting arranged accommodation for delegates. If there are 2 people in each room, the number of people without beds is 12; If there are three people in each room, there will be two more empty beds. How many dormitories are there? How many people support * *?
3. The existing 10 tons of goods are packed in several boxes, each box does not exceed one ton. Now a number of trucks are transferred, each with a maximum load of 3 tons. How many trucks can you send at least to ensure that it is delivered at one time?
4. How many prime numbers are there in nine consecutive natural numbers?