Mathematics 123 ha ha

Chinese 456 hehe

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1. Mathematical puzzle 123 If C is a positive integer, and a + B = C, B + C = D, D + a = B, then what is the minimum value of (a + b) (B + C) (c + D) (D + a)?
2. Mathematical calculation 123 As shown in the figure, M is a moving point on ad in the parallelogram ABCD to know that the area of the parallelogram ABCD is a, so does the area of the triangle MBC change? Why?
3. Root a ^ 2 = () (a > 0) ()(a=0) ()(a
4. Sky math Fill in the blanks 1. If you want to put a long and thin iron wire in a cube wooden box with 5 edges, the maximum length of the iron wire may be ()
5. Sky puzzle math problem The number of students in class 6 (1) ranges from 50 to 70. The ratio of boys to girls is 9:7. How many students are there in class 6 (1)?
6. 7,6,14,5,21,4,（）,（）,（）,（） 1,3,9,27,（）,（）,（） 1,3,7,15（）,63,（）,（） 1,4,9,（）,25,36,（）,（） 2 / 3, 3 / 8, 4 / 15, 5 / 24, (), (), () Complete the fifth line in the following table one thousand nine hundred and ninety-one 1991 1991 1991 3982 1991 1991 5973 5973 1991
7. Fill in the blanks 2,4,8, () () 32,
8. Fill in the blanks 0,1,3,8,21, () to explain the reason for the result
9. Find the law 3 ^ 2 = 4 + 5, 5 ^ 2 = 12 + 13, 7 ^ 2 = 24 + 25, find the law, and prove the method
10. Find the rule: (3 / 1 / 4 / 1 = 3 / 4) (9 / 5 / 8 / 5 = 9 / 8) (11 / 7 / 15 / 7 = 11 / 15) (B / A / C / a =?)
11. When a is greater than B and greater than 0, find (root a-root b) divided by root a + root B And a + B = 6 times root (AB)
12. 123+234+456+567+678+789 fifty-five thousand five hundred and fifty-five fast Simple calculation OK, there are points
13. 123+4=?
14. 1+2+3+4+123+1+2+3+4+123=
15. 1. Use 123 to form () different three digit numbers, The smallest one is (). 709 can be used to form () different two digit numbers, and the largest one is () 2. There are five different colors of coats and three different colors of trousers. If you want to match them, you can have () sets of different costumes at most
16. Choose a number from the three numbers 123, two numbers and three numbers to form one digit, two digit and three digit respectively. Which of them are prime numbers? emergency
17. Use 123 three digits to form four digits. Among the possible four digits, how many are at least two consecutive digits 2? Why 19? What are there?
18. How many quadruple digits can be made up of 123? Please list them one by one
19. How many three digit numbers can be composed of the numbers 1, 2, 3, 4 and 5 without repetition, and 2 and 3 are not adjacent?
20. Use the three numbers 123 to make up four digits. Among the four digits that may be made up, how many are there at least two consecutive digits that are 2?