0,1,2,3,4,5,6,7,8,9 form two addition and one multiplication

2*5=10
3+6=9
1+7=8

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1. How to fill the 10 numbers 0.1, 2, 3, 4, 5, 6, 7, 8, 9 in the arithmetic problem of addition and subtraction
2. Use 0,1,2,3.9 to form an addition vertical, and the numbers can't be used repeatedly
3. （）（）（）＋（）（）（） = () use the 10 numbers of 0, 1 and 2.9 to form an addition vertical. 0.9 cannot be used repeatedly
4. 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
5. How many four digit numbers can be made up of numbers 0, 1, 2, 3 and 4
6. 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
7. 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
8. Use 0, 1, 2, 3 to form a number without repetition. How many four digits are there
9. 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
10. Fill in 0123456789 in the box. Each number can only be used once. Think of at least four formulas
11. 15 multiplication formulas are composed of 1,2,3,4,5,6,7,8,9
12. 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
13. Observe the arrangement of the following numbers, and then fill in the appropriate numbers: 3, - 7, 11, - 15, 19, - 23______ ，______ ．
14. According to the following rules, the number of vacancies should be? 11,13,18,28,45, () 11,13,18,28,45,（） A 63 B 67 C 71 D 75
15. Put an appropriate number in each of the following spaces so that the sum of the three numbers in each row and column is 5 -4 -1
16. Fill in 81, 54, 36, (), (), 32 / 3 according to the rule. What number should I fill in the blank?
17. Put the eight numbers 2, 3, 4, 5, 6, 8, 10 and 12 into the following spaces to make the four sides in the figure add, subtract, multiply and divide () * () = () / () = () + () = () - () = first bracket
18. How to fill in the nine blank spaces of the five rings of the Olympic badge, so that the sum of the five rings is equal to 11?
19. In the five Olympic rings, there are nine blanks. Please fill in the nine blanks with 1 to 9 numbers. The sum of the numbers in each circle is equal to 13
20. Fill in the small circles with 1 to 9 numbers so that the sum of the four numbers on each side of the triangle is 17? O O O O O O O O O