6)÷(8
) =8 (6
) = three quarters = (
16) 12= (
0.75
) decimal
2, 204 decomposition prime factor is (
2×2×3× 17
)
3. Put two squares with a length of 2CM into a rectangle to reduce the surface area (
eight
)CM？ .
4. Among the numbers 40, 18, 123, 370, 732, 32 1, 120, 75, the numbers divisible by 2 are (
40.
18
370
732
120
); The number divisible by 5 is (40
370
120
75
); The number divisible by both 2 and 5 is (
40
370
120
)。
5. 32,000 meters? =(
3.2
) hectares
6200ML=(
6200/ 1000=62/ 10=3 1/5
(I fill in the scores.
6, the molecule is (
0), the score is zero.
7. The decimal unit of 13 points 1 1 is (
1.03 1
), plus (
13 point
) is the smallest prime number.
8. In descending order, 65438+9/03, 7/23, 165438+9/0 and 65438+7/03: (
9/ 1 1>9/ 13>7/ 13>7/23
)
judge
1 and 2/5 can mean dividing the unit 1 into five parts and taking such two points, or dividing 2 into five parts and taking 1 part.
(
×
)
If the side length of a square is expanded by 2 times, its volume will be expanded by 6 times.
(
×
)
3. The simplest score is less than 1.
(
×
)
4. Odd numbers cannot decompose prime factors.
(
×
)
5. The prime factor of decomposition 15 is: 15= 1×3×5.
(
×
)
1, a two-digit prime number. After exchanging one digit with ten digits, it is still a prime number, and one digit is different from ten digits. How many such figures are there? What is the difference?
2. The length of a handicraft box is 3 decimeters, the width is 2 decimeters, and the height is 1 decimeter. Now, three such handicraft boxes are packed together (or cuboids). How many packing methods can you think of? Please calculate the surface area of the most economical wrapping paper. Same packaging is a kind of packaging, ignoring the overlap of wrapping paper. )