There are 276 students in Grade 6. Everyone takes part in computer learning. According to statistics, 5 / 6 students take part in computer learning in the morning and 2 / 3 students take part in computer learning in the afternoon. How many students take part in computer learning in the morning and afternoon? There are three groups. The number of the first group is 1 / 3 of the sum of the number of the second and third groups. The number of the second group is 1 / 2 of the sum of the number of the first and third groups. There are 10 people in the third group. How many people are there in the three groups? emergency

There are 276 students in Grade 6. Everyone takes part in computer learning. According to statistics, 5 / 6 students take part in computer learning in the morning and 2 / 3 students take part in computer learning in the afternoon. How many students take part in computer learning in the morning and afternoon? There are three groups. The number of the first group is 1 / 3 of the sum of the number of the second and third groups. The number of the second group is 1 / 2 of the sum of the number of the first and third groups. There are 10 people in the third group. How many people are there in the three groups? emergency

1、 276 * 5 / 6 + 276 * 2 / 3-276 = 138
2、 If the first group consists of X members, the second group consists of 1 / 2 (x + 10) members and the third group consists of 10 members
[1 / 2 (x + 10) + 10] * 1 / 3 = x, x = 6,1 / 2 (x + 10) = 8
So the number of the three groups is: 6 + 8 + 10 = 24

Please tell me some math problems about volume two of grade four!
thank you!

There are 45 cypresses in the park, 20 more than twice as many pine trees as cypresses, and how many more pine trees than cypresses in the park
2. The road repair team needs to build a road. Team a builds 55 meters a day for 20 days. Team B builds 48 meters a day for 25 days. This is the right way to finish this section. How many meters are there in total?
3. Xiao Hong read a story book, a total of 180 pages. She read 15 pages a day. After 10 days, the rest read 6 pages a day. How many days will it take to finish?
There are () pages in total. I have watched () pages every day for () days
It will take () days to read () pages every day
4. To pave the floor tiles of a classroom, if the floor tiles with an area of 60 square meters are used to pave the floor, 80 pieces are needed. If the floor tiles with a side length of 5 decimeters are used to pave the floor, how many pieces are needed?
5. A car can carry four people, and a small bus can carry two people less than five times that of a small car. A large bus can carry 11 people more than the total number of cars and non buses. How many people can a large bus carry?
6. Use a 32 cm long wire to make a rectangle. If the length and width are the whole centimeter, how many ways can you do it? List all the situations and find out the largest and smallest area. What do you find?
7. As shown in the picture, Uncle Zhang's family has a rectangular field with tomatoes and cucumbers
(1) How many square meters does this land cover?
(2) How much more square meters is cucumber less than tomato? How many different ways can you think of?
8. Xiao Ming's father has two suits and three ties. Today, he went to the company meeting to wear a suit and a tie. How many matching methods are there?
9. Xiaohua, Xiaoming, Xiaodong, Xiaoyong four good friends go to the park to play, four people stand in a row to take a picture, how many different ways to stand in line? Each two people rent a boat, how many different ways to match?
10. How many unrepeated three digit numbers can be made up of 5, 6, 7, 8 and arrange them from big to small

1. Dasheng has eight hexagons with his stick. If he uses these sticks to make a square, how many can he make? It's a list. I'll hand in my homework tomorrow

There are 8 * 6 = 48 rods in 8 hexagons
Each square needs four sticks
So 48 △ 4 = 12

There are two pieces of wood a and B, one is 1.8 meters long and the other is 2.6 meters long. The worker saws a section of the same length from the two pieces of wood, and the remaining part of the second piece is twice as long as the remaining part of the first piece. How many meters are the two pieces sawed?

The remaining length difference of the step-by-step formula is 2.6-1.8 = 0.8 (m) the number of parts corresponding to the remaining length difference is 2-1 = 1 (part) & nbsp; & nbsp; & nbsp; the remaining length after cutting is 0.8 × 2 = 1.6 (m) or 0.8 × 1 = 0.8 (m) & nbsp; 0.8 △ 2-1 = 0.8 (m) & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cut