1 class and class 5 (1) students donated books to students in poor mountainous areas, some donated two books, some donated three books, and some donated four books. It is known that class 1/2 donated two books, class 1/4 donated three books and class 1/5 donated four books. How many people didn't take part in the book donation activity? Second, the * * * values of 8 kg of green beans and 9 kg of spinach are 16.8 yuan, and the * * * values of 9 kg of green beans and 8 kg of spinach are 17.2 yuan. Find the unit price of green beans and spinach. Three, a rectangle, the length and width are increased by 5 cm, and the area is increased by 125 cm 2. What is the original circumference of this rectangle? Fourth, Xiaoming and Xiaohua did the same number of oral arithmetic problems together. When Xiaoming did his homework 1/3, he asked Xiaohua, "Where did you do it?" Xiaohua said, "I still have 45 questions." When Xiaoming made the remaining half, he asked Xiaohua again. Xiaohua said, "It's just half done." If their speed of doing problems remains the same, find the total number of problems they do. Five? Put two identical cubes together to make a cuboid? The surface area has decreased by 72 square centimeters? What is the surface area of this cuboid? ? Square centimeters? What is the volume? ? Six cubic centimeters, a cuboid? What if the length is reduced by 2 cm? Same width and height? Its volume has been reduced by 48 cubic centimeters? If the width is increased by 3 cm? The length and height are the same? Its volume has increased by 99 cubic centimeters? If the height increases by 4 cm? Same length and width? Its volume will increase by 352 cubic centimeters. What is the surface area of the original cuboid? ? Square centimeters. Seven,? Three identical cuboids? The total length of the side is 288 cm? The three sides of each cuboid intersecting at a vertex are exactly three continuous natural numbers. Color these three cuboids? Draw a side? Draw both sides of one? A picture has three sides. Cut three cuboids into cubes with side length 1 cm after painting? Only a colored cube has it? ? A.8. Party A and Party B run in the same place and in the same direction at the same time on the 300-meter circular track. Party A runs 5 meters per second and Party B runs 4.4 meters per second. How many meters before the first 1 meeting of Party A and Party B?

9. A school organized some teachers and students to visit A, and the whole fare from school to A was in 25 yuan. For group ticket purchase, the passenger transport company has two preferential schemes to choose from: scheme 1: all teachers and students buy tickets at 88% of the fare; Option 2: The first 20 people buy full tickets, starting from 2 1 person, and each person buys tickets at 80% of the fare. If you are the organizer, please discuss which scheme is more economical according to the number of teachers and students.

Those three are here/view/39 feee3483c4b4cf7cd15d.html I'm exhausted. Choose me.