2. Move the decimal point 4.87 three places to the left and two places to the right, and the number is (0.487).
3. 9.5607 is (4) decimal places, one decimal place is about (9.6) and two decimal places are about (9.56).
4. The smallest odd number is (1), the smallest prime number is (2), the smallest composite number is (4), which is both prime number and even number (2), and the largest prime number within 20 is (19).
5. The prime factor of decomposition 36 is (2×2×3×3).
6. Because a=2×3×7 and b=2×3×3×5, the greatest common divisor of A and B is (6) and the least common multiple is (630).
7. If x6 is a false score and x7 is a true score, x=(6).
8. If the number of A is expanded by 10 times, which is equal to the number of B, and the sum of A and B is 22, then the number of A is (2).
9. The sum of three consecutive even numbers is 72, and these three even numbers are (22), (26) and (24) respectively.
10, x and y are natural numbers, x÷y=3(y≠0), the greatest common divisor of x and y is (y), and the least common multiple is (x).
1 1, a number, which is the smallest prime number in thousands, the smallest natural number in hundreds, the smallest composite number in units, the largest number in percentiles, and the number in other digits is 0. This number is written as (2004) and read as (2004).
12, the sum of three consecutive odd numbers is 129, where the largest odd number is (45) and the prime number factor is (3? ×5)。
13, the greatest common divisor of two numbers is 1, and the least common multiple is 323. These two numbers are (17) and (19), or (1) and (323).
14. The smallest number in which the remainder 2 is divisible by 3, 4 or 7 is (86).
15, and the unit of the score is 18. The maximum true score is (17/ 18), plus at least (1) such score units, it becomes a false score.
16 has 45,0.045 (0.001).
17. Divide a 5-meter-long iron wire into 8 segments on average, and each segment is the length of the iron wire (1/8), and each segment is 0.625 meters long.
18, and the unit of score is111. The sum of the maximum true score and the minimum false score is (1111,1.
19, A and B are prime numbers and their greatest common divisor is (1).
20. Xiaohong has a pencil, and each pencil is 0.2 yuan, so a pencil costs * * * yuan (0.2a).
2 1, warehouse a 34 and warehouse b 23 are equal, warehouse a: warehouse b = (8): (9). It is known that two warehouses have 360 tons of grain, warehouse A has (3240/ 17) tons of grain, and warehouse B has (2880/ 17) tons of grain.
22. If 7x=8y, then x: y = (8): (7).
23. If the radius of the big circle is 8 cm and the diameter of the small circle is 6 cm, the perimeter ratio of the big circle to the small circle is (8:3), and the area ratio of the small circle to the big circle is (64:9).
24. Put 5g of salt into 50g of water, and the ratio of salt to brine is (1:1).
25. Party A and Party B each have a few yuan. If Party A gives Party B 20% of all his money, all their money is exactly equal. It turns out that the simplest integer ratio of all their money is (1:60%=5:3).
26. If x÷30=0.3, then 2x+1= (19); There are three consecutive even numbers, the middle of which is m, so the smallest even number is (m-2).
27. Using the 24-hour clock, it is (15) at 3 pm, 1 1 at night (23), 12 at night (24) and (0) the next day.
28. A store is open from 9:00- 18:00 every day, and it is open for 9 hours all day.
29.15m40cm = (15.4) m = (1540) cm6400ml = (6.4) l = (6.4) cubic decimeter.
5.4 square kilometers =(540) hectares = (5,400,000) square meters 3 hours and 45 minutes =(3.75) hours.
834 cubic meters =(834000) cubic decimeter 1 cubic meter 50 cubic decimeter =( 1.05) cubic meter.
3 tons 500 kg = (3,500) kg 1.5 l =( 1500) ml =( 1500) cubic centimeter.
3.25 km = 3 km (250 m) 0.65 m = 6 decimeters (5 cm).
30. The volume of a cylinder is 60 cubic centimeters, and the volume of a cone with equal base and equal height is (20) cubic centimeters.
3 1——40:240
1.5 3.5325
3 9
circle
90 54
The rectangular base has a high perimeter (sometimes the other way around).
48 * 31.41592624 * 3.1415926 (I don't know how much you want, count it yourself).
2. 1 m
25*3. 14 15926
3. 14 15926