1 Pythagoras 3,4,5: Hook three strands, four strings, five, 12, 13: May 12 Record a lifetime (13) 6,8,12.

Special Pythagorean Number: The number of continuous Pythagorean Numbers is only 3, 4 and 5, and the number of continuous even Pythagorean Numbers is only 6, 8, 10.

Formula of Pythagorean number

1, odd array formula: square it and divide it into two consecutive numbers. 5 ~ 2 = 25,25 = 12+13, so 5,12,13 is a set of Pythagorean numbers. 7~2=49, 49=24+25, so 7, 24 and 25 are a set of Pythagorean numbers. 9 ~ 2 = 8 1, 8 1 = 40+4 1, so 9,40,4 1 is a set of Pythagorean numbers.

2. Even set formula: decompose a half square into two numbers with a difference of 2. 8 ~ 2 = 64, 64/2 = 32, 32 = 15+ 17, so 8, 15, 17 are a set of Pythagorean numbers10 ~ 2 =/kloc. 12 ~ 2 = 144,144/2 = 72,72 = 35+37, so 12,35,37 is a set of Pythagorean numbers.

Mathematics learning method

1, pay attention to the key points. I must preview before class. When I have time, I will read it carefully. I will remember the definitions, theorems and formulas that the teacher wants to input first, and then look at some examples to understand the application of definitions and theorems. What I understand and what I don't understand will be formed in my mind.

In class, as soon as the teacher opens his mouth, I know what the teacher will say. I read my own books if I can, and listen carefully if I can't. I am good at grasping the key points in lectures. When I remember, I think other students remember everything. I'm not, but I never remember things in books, such as definitions, theorems, formulas and examples in books.

I only remember some things that are not in the book, things I don't know, and important or difficult things that the teacher said. I often make some notes in books. After reading my book, it is full of graffiti, which is not suitable for others to read. When I turn over the books in the future, I will recall all the contents of this section from my records. I remembered the book as soon as I turned it over, and I remembered it firmly as soon as I turned it over.

2. Read more counseling books. I will definitely finish all the homework assigned by the teacher, but I will not be satisfied with the homework assigned by the teacher. I will also read some tutorial books and do some homework on them until I can understand the meaning of definitions, theorems and formulas, and try to solve a problem in various ways, so as to draw inferences from others.