There is a passage in "Arabian Nights": A flock of pigeons, some singing in the trees, some foraging on the ground. A pigeon in the tree said to the pigeons foraging on the ground, "If one of you flies, the pigeons under the tree belong to the whole flock;" If one flies down from the tree, there will be as many pigeons on the tree as under it. " Do you know how many pigeons are on and under the tree?

The ticket prices of city parks are shown in the following table:

The number of ticket buyers is more than 50,51~ 100,100.

Ticket price 10 yuan/8 yuan/5 yuan/person.

More than 50 people from Class A and Class B 100, Grade One in a school, went to the park for a get-together activity, and less than 50 people from Class A and Class B. If you buy tickets according to the schedule, you have to pay them to 920 yuan. Two classes buy tickets together, and one wants 5 15 yuan. How many people are there in Class A and Class B respectively?

A shopping mall plans to allocate 90,000 yuan to buy 50 TV sets from manufacturers. It is known that this manufacturer produces three different models of TV sets, the ex-factory price is RMB 0.5 million per set, RMB 2 1.0 million per set, and RMB 2,500 per set. (9 points)

(1) If the shopping mall buys 50 TV sets of two different models at the same time, and it costs 90,000 yuan, please study the shopping plan of the shopping mall;

(2) If a shopping mall sells a first-class TV set with a profit of 150 yuan, a second-class TV set with a profit of 200 yuan and a third-class TV set with a profit of 250 yuan, which purchase scheme is the most profitable?

A company produces a publicity material, and Company A proposes to charge 20 yuan for each material, with a design fee of 3,000 yuan. Company B proposed that 30 yuan should be charged for each material, and no design fee should be charged. Please calculate which company should the company choose? , 1, it is better to buy a junior one information book. We didn't want to do it at first, but we didn't expect you to find a topic here. 2. Go to the bookstore! Have what you want. 2. Just buy a copy of Xue Hai Storm. You can go to the bookstore. It's a mess. It's enough for you to watch all day. Moreover, the binary linear equation is very simple, so I suggest you expand it. A little brain-burning.

I recommend: improve, synchronize, teach and learn (yes, it's no problem to get into the top 20 of the whole grade)

Your math teacher will definitely have very good exercises, so I suggest you go to Taobao, O(∩_∩)O haha ~

Note: you are really slow to learn. We have all studied factors. . (* _ *) Hee hee ...................................................................................................

I am in the first grade; There are too few questions in the workbook; Please find some good questions; Thank you; If you give a lot of rewards; Ha ha.