1,3.45×6.8+65.5×0.68=( )

2, there are two numbers A = 0.00...025, B = 0.00...04.

2002 0, 2003 0

( 1)a+b=( ) (2)a×b=()

3,20 1-20 1=( ).

4. For a column number (), 1 1,17,23, (), in the following four groups of numbers, the first number is filled in a bracket and the last number is filled in a bracket, which can make this column number regular. The first number is _ _ _ _ _

A, 5 and 25 B, 5 and 27 C, 5 and 29 D, 5 and 3 1

The calculator designed by Xiaoming has only one function key. Press minus 19 for the first time, plus 17 for the second time, minus 19 for the third time and plus 17 for the fourth time ... Now, first enter a number as 2003. Please keep pressing the function key.

The emergency rescue center had to transport a batch of daily necessities to the earthquake-stricken area. If each car is loaded with 3 tons, 2 tons of these goods will not be shipped; If each car is loaded with 1 ton, other goods can be loaded with 1 ton after loading this batch of goods. Please answer: This shipment has () tons.

Class 7,5 (1) participated in the math competition, and the preliminary results were: the average score of the whole class was 90, the average score of boys was 88, and the average score of girls was 93. There are 18 girls in this class, so there are () boys.

Second, (8 points for each question, ***48 points)

1, two cars, A and B, travel in opposite directions from two places 589 kilometers apart at the same time. Car A is 60 kilometers per hour, and car B is 64 kilometers per hour. After driving for () hours, the two cars are still 93 kilometers apart. Keep walking for () hours, the distance is 93 kilometers.

2. In the fifth grade, 97 people joined the school philatelic association and collected 2367 stamps. The school philatelic association made the following bar chart according to the average number of stamps collected by each class in grade five. It is known that there are 34 people in Class Five (1), and each person collects 28 stamps on average, so there are _ _ _ _ _ _ _ people in Class Five (2).

There is a rectangular garden with a 2-meter-wide pedestrian walkway in the middle (as shown in the figure below). This garden is 50 meters long and 30 meters wide. Then, the area of planting flowers is () square meters.

4. In order to celebrate the victory of the National People's Congress and China People's Political Consultative Conference, 2003 colored lanterns were hung in Century Square according to certain rules. Hang three purple lanterns first, then five yellow lanterns, then nine red lanterns, and then repeat the above arrangement in turn. Finally, there are not enough red lanterns. Therefore, there are _ _ _ _ _ _ _ _ _ _ among the lanterns in 2003.

5, the following four graphics, according to the grid lines for crease, can be folded into a cube is ().

Classes 6 and 5 (1) have no more than 50 students. When studying in groups, you can divide them into groups of 3, 4, 6 or 8 people according to the different teaching contents, and all the points have just been learned. There may be _ _ _ _ _ students in this class, or there may be _ _ _ _ _ students.

III. (Each question 15, ***30)

1, A and B rode camels to explore the desert. They walk 40 kilometers into the desert every day. It is known that each person can bring one person food and water for up to 48 days. On the way, A has something to return early. If you can store some food and water on the way for B to take back, Q: B can go deep into the desert () kilometers at most.

2. The following figure is a schematic diagram of fastening the printed mail. Xiaozhen wrapped it with three ropes of 60m, 50m and 34m. The joint of each rope is 2mm. ) So, the length, width and height of this printed email are () decimeters.