Use 0, 1, 2, 3 to form a number without repetition. How many four digits are there

(1) There are three ways to select thousand bits (0 cannot be selected)
(2) There are three ways to choose a hundred,
(3) There are two choices for the ten,
(4) There is one way to choose individual position,
According to the principle of multiplication: there are 18 kinds of 3 × 3 × 2 × 1

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1. Write 0 1 2 4 5 6 7 8 9 into three formulas (one addition, one subtraction, one multiplication). Each number is only used once. How can we solve it
2. Fill in 0123456789 in the box. Each number can only be used once. Think of at least four formulas
3. 0123456789 ten numbers are listed in one formula. All numbers can only be used once
4. Use 0123456789 ten numbers to form two five digit numbers, how to combine the product to the maximum? Why does 96521 * 87430 have the largest combined product? Please explain the reason of this combination.
5. With 0, 1, 2 The ten numbers, 9, constitute a four digit number, a three digit number, a two digit number and a one digit number. Each number can only be used once, so that the sum of the four numbers equals 1998, then the minimum value of the three digits is______ ．
6. 0123456789 how to make up the vertical column of addition with ten numbers
7. 0-9 ten sequence of five addition formula, each number only once 0123456789 ten numbers are filled in (), each number is used only once. () + () = () + () = () + () = () + () = () + () = () + ()
8. Fill in 10 numbers of 0123456789 in (), each number can only be used once () + () = () - () = () - () = () - () = () - () = ()-（
9. Fill in 10 numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 in □, and each number is used only once
10. Fill in the ten numbers 0123456789 in (). Fill in each number once. () + () = (), () - () = (), () times 9 () = ()
11. How many five digit numbers can be made up of six numbers 1, 2, 3, 4, 5 and 6? 6*5*4*3*2*1=720 Why should we multiply the number without repetition from 6 to 1? What is the meaning of multiplication here? Please help me understand deeply
12. Among the three digit numbers without repetition composed of numbers 1, 2, 3, 4, 5 and 6, the number that is a multiple of 9 is () A. 12 B. 18 C. 20 D. 30
13. How many four digit numbers can be made up of numbers 0, 1, 2, 3 and 4
14. With the four numbers of 2, 3, 4 and 5, many four digit numbers without repetition can be formed. What is the sum of all these four digit numbers
15. （）（）（）＋（）（）（） = () use the 10 numbers of 0, 1 and 2.9 to form an addition vertical. 0.9 cannot be used repeatedly
16. Use 0,1,2,3.9 to form an addition vertical, and the numbers can't be used repeatedly
17. How to fill the 10 numbers 0.1, 2, 3, 4, 5, 6, 7, 8, 9 in the arithmetic problem of addition and subtraction
18. 0,1,2,3,4,5,6,7,8,9 form two addition and one multiplication
19. 15 multiplication formulas are composed of 1,2,3,4,5,6,7,8,9
20. In the following formula, each Chinese character represents a number, the same Chinese character represents the same number, and different Chinese characters represent different numbers. When each Chinese character represents what number, the following formula holds? 1. Soldiers, artillery and horses +Artillery truck pawn ——————— Chariot pawn, horseman pawn We love science × 5 —————————— We love numbers Is it mathematics or not We love mathematics × 5 —————————— We love numbers