How to write 10 numbers from 0 to 9 into the box, each number is used only once?

Answer: (0)+(9) = (1)+(8) = (2)+(7) = (3)+(6) = (4)+(5).

Analysis:

1, 0~9*** has the number of 10, which is an arithmetic progression with a tolerance of 0, 1.

The result of adding 9 to 2.0 is 45, so divide 45 into five different groups, and the result of each group is equal to 45/5=9.

3. Know that the result of each group is 9, and then calculate by subtraction. 9 The result of only one number is 9, and the other number must be 0.

4. Then calculate 8,9-8 = 1, and the other number in this group is1,and so on.

Basic attribute

1, attribute 1

Adding (or subtracting) the same algebraic expression on both sides of the equation still holds.

If a=b

Then a+c = b+c;

2. Nature 2

When both sides of the equation are multiplied or divided by the same non-zero algebraic expression, the equation still holds.

If a=b

Then there is a c = b c

Or a ÷ c = b ÷ c (c ≠ 0);

3. Nature 3

This equation is transitive.

If a 1 = a2, a2 = a3, a3 = a4, ... an = an, then a 1 = a2 = a3 = a4 =...= an.