Use the four numbers 1.2.3.4 to form a multiplication of two digits by two digits To be the biggest, I'm a primary school student. It's better to list all, with vertical

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1. Choose the numbers 5, 6, 7 and 8 to form the multiplication formula of two digit by two digit to maximize the product Select the numbers 5, 6, 7 and 8 to form the multiplication formula of two digit by two digit, 1. Product maximum () * () = () 2, product minimum: () 8 () = ()
2. Use the numbers 0, 2, 5 and 7 to form the formula of multiplying two digits by two digits: 1. How many can you write? 2. What is the largest and smallest product?
3. 2. 3, 4 and 5 constitute the formula of multiplying two digits by two digits, and the product is the largest What are the rules?
4. With 4, 5, 6 and 7, which two digit multiplication formula can these four numbers form? What are the minimum product and the maximum product?
5. In the following, fill in 1, 2, 3, 4, 5, 6, 7, 8 and 9 (the number in each formula cannot be repeated, and the numerator of fraction part is less than denominator), so that the value of formula a with fraction is the largest and that of formula B is the smallest
6. In the following, fill in 1, 2, 3, 4, 5, 6, 7, 8 and 9 (the number in each formula cannot be repeated, and the numerator of fraction part is less than denominator), so that the value of formula a with fraction is the largest and that of formula B is the smallest
7. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
8. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
9. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
10. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
11. A multiplication formula of two digits multiplied by two digits, one of which is 29. If you add two multipliers and the product, you get 839. What's the other multiplier?
12. Use 2,0,5,6 to form a multiplication formula of two digits multiplied by two digits. Can you write the formula of maximum and minimum product
13. Use 5, 6, 7 and 8 to form the multiplication formula of multiplying two digits by two digits. The formula that maximizes the product is? The formula that minimizes the product is?
14. Use 4, 5, 6 and 7 to form the multiplication formula of multiplying two digits by two digits (the number can't be used repeatedly). Please write the formula of maximum and minimum product?
15. Use 0.1.2.3.4.5.6.7.8.9. These ten numbers to form an addition vertical? (ten numbers cannot be repeated)
16. Use eight numbers in 1.2.3.4.5.6.7.8 to form a division formula. The number can't repeat a four digit division by a three digit division
17. Use 0, 1, 2, 3 and 4 to form several three digit numbers without repetition? (to make an equation)
18. The math problem has a subtraction formula, the subtracted plus the subtracted, plus their difference, the sum is 512, the subtraction is 125, how to get the formula
19. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 100. When the subtracted is 38, the subtracted is (), and the difference is ()
20. In calculating a decimal subtraction, Xiao Hua regards 8 on the tenth place of the subtracted as 3 and 1 on the hundredth place of the subtracted as 7. The wrong answer is different from the correct one______ ．