Give me 20 math questions to answer

a) Calculation:

1）a-(a-3b+4c)+3(-c+2b)

2）(3x2-2xy+7)-(4x2+5xy+6)

3）2x2-

2) Simplification 1) a>0, b<0, |6-5b|-|3a-2b|-|6b-1|

2）10, b<0

6-5b|-|3a-2b|-|6b-1|

6-5b-(3a-2b)-(1-6b)

6-5b-3a+2b-1+6b=-3a+3b+5

2）∵1|1-a|+|3-a|+|a-5|=a-1+3-a+5-a=-a+7

AB two places are 100 meters apart, A and B two students respectively from AB two places at the same time, walking in the opposite direction, A 6 meters per second, B 4 meters per second, A with a dog runs 10 meters per second, the dog immediately returns to run to A after meeting B, immediately returns to run to B after meeting A, immediately returns to run to B after meeting A, and so on, until A and B meet the two classmates, how many roads has this dog run?

A group of students went to the factory to visit at a speed of 5 kilometers, when after walking for 1 hour, a student went back to the school to pick up something, he returned to the school at a speed of 1 kilometer hour, and immediately chased the team at the same speed after picking up the things (not counting the time to pick up the things), and then caught up with the team at a distance of kilometers from the factory, asking for the distance from the school to the factory.

Take out 140 potatoes from a basket, and then take out the remaining 60%, and then the remaining potatoes are exactly one-sixth of the original total, how many potatoes are in this basket.

A temple is in the mountains and forests, and I don't know how many monks there are in the temple.

Three hundred and sixty-four bowls, see if you run them out.

Three people eat a bowl of rice, and four people drink a bowl of soup.

Who will count the kings, how many monks are there in the temple?

In the environmental knowledge competition, the average score of a school team is 88 points, of which the average score of girls is 10% higher than that of men and women, and the number of boys is 10% more than that of girls.

A school organizes teachers and students to go on an outing, and if they rent a number of 45 cars separately, they are just full; If you rent a 60-seater bus separately, you can rent 1 less car, and there are 30 empty seats left, asking for the number of people participating in the spring outing.

A man walked from his home to the bus station, and it took him 3 kilometers in the first hour, and he looked at his watch and estimated that he would be 40 minutes late at this rate, so he walked the rest of the way at a speed of 4 kilometers per hour, but instead arrived 45 minutes early, asking for the distance from the person's home to the bus station.

If the equation 3x+8=m+3 about x has the same solution as the equation x-2m-5=0, then x= , m=

1.Several cars were carrying a consignment. If each truck is loaded with tons, 2 tons of this batch of goods cannot be transported; If each vehicle is loaded with 4 tons, after loading this batch of goods, it can also load 1 ton of other goods. How many tons is there in this shipment? How many cars are there?

If two people go to the depths of the desert, each of them walks 20 kilometers a day, and each person carries enough food and water for one person for 24 days, how far can a and B good man go and return to the starting point?

3.On the weekend, Xiaoqiang and his parents went hiking, and after walking a few meters from home, they realized that they could reach the halfpoint between the two places with their destination by walking another 2 kilometers, so they walked another 4 kilometers, in fact, they were only 1 3 miles away from their destination. How many kilometers did they cover on this hike?

4.Olympiad math questions 1998 9 1998 9 + 1

5.The big monk eats two steamed buns at a time, and the two little monks eat 1 steamed bun at a time, and now there are 99 big and small monks and 99 steamed buns, how many people are there in each of the big and small monks?

6.A group of passengers decided to divide the number of large cars into several cars, and to make each car have the same number of people At first, each car took 22 people, and found that one person could not sit in the car If you drove away an empty car, then all the passengers would just divide the rest of the cars equally It is known that each car cannot carry more than 32 passengers, so how many cars are there? How many people are in this group?

7.A, B, C, and D solve the problem, A solves one-third of the total, B solves one-fifth of the total, and the ratio of the number of questions solved by C and D is 4:3.

8.When A9There are 200 more math books than language books, and 3 4 math books are equal to 7 8 language booksHow many Chinese and math books are there?

10.Nan Nan and Will have a table tennis match, (five games, as long as you win three games first, you will win) Nan Nan 3:0 The probability of winning Will 3:0 is ( ) fill in the percentage).