![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
What are the three digits randomly combined with 0-9, and each digit can be repeated For example, 123.321.524.163 If the number of hundred can be zero, what are the specific numbers? Give a calculation method or software
1、 Repeat numbers are allowed, such as 122666, etc
There are 9 ways to choose the hundred, 10 ways to choose the ten, and 10 ways to choose the single,
Total 9 * 10 * 10 = 900
2、 Duplicate numbers are not allowed
There are nine ways to take the hundred, nine ways to take the ten, and eight ways to take the single,
Total 9 * 9 * 8 = 648
If the number of hundreds can be zero and repeated, it is
There are 10 ways to choose the number of hundreds, 10 ways to choose the number of tens, and 10 ways to choose the number of tens
Total 10 * 10 * 10 = 1000
RELATED INFORMATIONS
- 1. How much is 1 mm?
- 2. How many um is 1 mm?
- 3. Unit conversion: how much MIC is 1 mm
- 4. How many meters are um and nm?
- 5. What unit of length is nm? The wavelength of ultraviolet light is hundreds of nm. How long is nm?
- 6. How many nm is one um equal to
- 7. 60um=_ nm,50km=_ um
- 8. 0、25=（）um（）nm
- 9. Conversion of physical units in grade 2 of junior high school 1.5x105nm = () cm = () M = () km 4.76x105km = () DM = () μ M = () NM
- 10. Complete the following unit conversion [1] 1.72m = [] cm = [] nm 【2】6ml【】=cm³【】=m³ 【3】13.6×10³kg/m³=【】g/cm³ The density of alcohol is 0.8 × 103kg / m3, which means that the mass of 1m3 alcohol is 0.8 × 103kg When part of a bottle of alcohol is used up, the mass, volume and density of the remaining alcohol are determined Our classroom is 9 m long, 6 m wide and 4 m high. The air mass in the classroom is 〔 kg 〕, which is higher than your mass 〔 big 〕 and 〔 small 〕. A and B are two equal height cylinders with equal mass. If the bottom area of a is three times that of B, how many times the density of a is that of B We need 400 grams of alcohol. We don't need a balance. We only need a measuring cylinder. We should measure the volume of alcohol to be [] CM & # 179;
- 11. There are three one digit numbers (0-9). They can be used to form three digit numbers. There are six ways to arrange them. Six three digit numbers can be formed There are three one digit numbers (0-9). They can be used to form three digit numbers. There are six permutation methods, which can form six three digit numbers. It is known that the sum of five three digit numbers is 3194. Find another three digit number
- 12. -24.24.1.3 how to arrange these numbers to be equal to 24
- 13. If the sum of four digits is equal to 4, from small to large, what number is 2011
- 14. Use four numbers 1.3.4.8 to form different four digit numbers and arrange them from small to large. What's the 17th number?
- 15. Input 9 numbers of 123456789 into three sides of triangle (4 numbers for each side). The sum of each side is 17 x x x x x x x x x The border is triangular
- 16. Put 1,2,3,4,. 5,6,7,8,9 in the nine blanks of the five Olympic rings, so that the sum of the numbers in each circle is equal to 13. How to fill in? The process should be detailed How to determine the four overlapping numbers, 1 + 2 + 3 + 4... + 9 = 65 13 * 5 = 45 65-45 = 20 what do you do next?
- 17. The proportion of 3 / 4,5 / 4,2 with a number
- 18. What are the ways to match 2, 4 and 8 with a number to form a proportion?
- 19. Can 2, 3, 4 and 5 form a proportion
- 20. Put the four numbers in each group into different proportions (write two each) (1) 3.5 14 28 7 (2) 1 / 4 1 / 5 2.4 3