1-9 these figures, four digits divided by two digits equal to three digits, can not be repeated!

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• 1. In 123456789, multiply one of the four numbers by the other four digits. The number cannot be repeated
• 2. Two math problems, tell me the formula and why The water content of 100 tons of grapes measured in Xinjiang is 99% of 100, and that of grapes transported to Nanjing is 98% of 100. How many tons are left after the grapes are transported to Nanjing? There are two bags of rice, and the weight of the second bag is 4 / 7 of the second bag. If 8 and 2 / 5 kg are taken out of the first bag and put into the second bag, the two bags are equal, How many kilos each of these two bags of rice weighs? Tell me the formula and why. You can give more points. Please give details. Thank you
• 3. 52 students went boating, a total of 11 boats, including 6 people for each big boat and 4 people for each small boat?
• 4. How do 1, - 2,2,3 count as 24 o'clock
• 5. 4, 5, 8 and 13 are 24 points
• 6. Calculate 24 points: two 3's and two 6's, one for each number
• 7. There are several ways to calculate 24 points The more ways, the better
• 8. 10 10 9 9 is 24 o'clock How to calculate?
• 9. Two times a is the difference between B and 3
• 10. Is π - 3.14 equal to 0? Brother's math problem is a little difficult. This π is 3. If it is, why don't you give us 3.14 directly
• 11. Fill in the multiplication sign or division sign in the nine brackets of the following formula to make the equation true 10 () 9 () 8 () 7 () 6 () 5 () 4 () 3 () 2 () 1 = 64 / 7
• 12. Please fill in the brackets below with the nine numbers 1 - 9 to make the equation true. Each number can only be used once （ ）÷（ ）=（ ）÷（ ）=（ ）（ ）（ ）÷（ ）（ )
• 13. Use 1,3,5,7,9 to form a formula of multiplying three digits by two digits, and write the formula of maximum product
• 14. It is known that ABC is a three digit number, and the sum of the other five three digits composed of a, B and C is 2006, The sum of the other five three digits composed of a, B and C is 2006, so the difference between the largest and the smallest of the six three digits is
• 15. With the 10 numbers from 0 to 9, you can make up the even number of three digits without repetition 1. When the mantissa is 2, 4, 6 and 8, the number of bits combined is 4. Because the hundreds cannot be 0, the number of bits combined is 8, and the number of bits combined is 8 × 8 × 4 = 256 2. When the mantissa is 0, the combination of 100 bits is 9, the combination of 10 bits is 8, and the total number of combinations is 9 × 8 × 1 = 72 Total 256 + 72 = 328 On the basis of this classification, I have a question: why should we take the hundred first, if we take the ten first. Process 1: there are 9 combinations of ten (ten can take 0), and 7 combinations of hundred
• 16. How many three digit numbers can be made up of 10 numbers from 0 to 9?
• 17. How many three digit numbers can these numbers make up
• 18. What kind of multiplication formula can 2 + 2 + 2 + 4 be written?
• 19. How many multiplication formulas can you write for the whole ten times one digit, Lu 240?
• 20. In a multiplication, if one factor is increased by 5, the product is increased by 100. If the other factor is increased by 4, the product is increased by 120 Can you directly divide 100 by 5 to get 20, and then divide 120 by 4, the answer is 600