1, 4.08 liters =( 4.08) cubic decimeter (4,080) cubic centimeter.

3.06 cubic decimeter =( 3.06) liter = (3,060) ml.

2、( 3 )÷( 4 ) = 3/4 = 6÷( 8 ) = 0.75 =

3. Cut the 3-meter-long wire into five sections on average, each section is (1/5), (1 3/5) and (0.6) meters of this wire. ..

4. A cuboid iron box with no cover, 5 decimeters long, 3 decimeters wide, 2 decimeters high, and the bottom circumference is (16 decimeters). At least 47 square decimeters of iron sheet should be used to process this iron box.

5. A rectangular tank with a length of 1 m, a width of 60 cm and a depth of 40 cm. The volume of the sink is 240 liters.

6. If a=5b, then the greatest common factor of A and B is (b) and the smallest common multiple is (5b).

7. There is a number divided by 10, 12, 15, the remainder is 3, and the minimum number is (63).

Common multiples of 4 and 6 in 8 and 50 are (12, 24, 36, 48), and these numbers are multiples of (2, 6, 12).

9. Where the numbers are 0, 1, 2, 3, 7, 17, 2 1, 5 1, 53, 78, 9 1,1. (1, 3,5,17,21,15,91,165438) is an odd number, (2,78.

10, cuboid, with a bottom circumference of 26 cm and a height of 6 cm. The sum of the sides of this cuboid is (76) and the volume is ().

1 1. A rectangular pool can store 8 meters of water. If it is filled with 6 cubic meters of water every minute and 20 minutes, the pool area will be (0. 15) square meters.

12. In, a is a nonzero natural number, and when a is ((a- 1)/a), it is the maximum true fraction; When a is (a/a), it is the minimum error score; When a is (2), it is the smallest prime number.

13, a regular style with a side length of α cm is cut into two identical cuboids, and the surface area is increased (2a? Square centimeter), the surface area of each cuboid is (42a? Square centimeters).

The decimal unit of 14 is (), and there are () such units. The sum of such units () is the smallest composite number.

Third, solve the problem.

1, 40 minutes of science class, students spent several hours doing experiments, teachers spent several hours explaining, how much time was left for students to discuss and communicate?

A rope is 6 meters long. The first time I used the full length, the second time I used the full length. How much is left in this rope?

A classroom is 8 meters long, 6 meters wide and 4 meters high. Paint the roof and four walls of the classroom. Excluding doors, windows and blackboards, the area is 25.4 square meters. What is a painting area?

8× 6+2× 8× 4+2× 6× 4-25.4 =134.6 m2

4. A cuboid fuel tank with a length of 5cm, a width of 4cm and a height of 6cm. Each liter of gasoline weighs 0.74 kg. So how much iron does it take to make this oil drum? How many liters of gasoline can this oil drum hold at most? (Numbers are reserved as integers)

The iron sheet for making this oil drum: 2×5×4+2×5×6+2×4×6= 148 square decimeter.

Volume of oil drum: 5×4×6= 120 cubic decimeter = 120 liter.

120×0.74=88.8≈88 liters