7.1. Replace each asterisk in the example of adding decimal fractions

$$
0, * *+0, * *+0, * *+0, * *=1
$$

with the digit 2 or the digit 3 so that the equation is correct.
Solution: The sum of the four digits in the hundredths place must be a multiple of 10. Since each of the digits is either 2 or 3, there must be exactly two 2s and two 3s among these digits. Then, the sum of the digits in the tens place should end in the digit 9, so among the tens digits, there are three 2s and one 3. It is clear that any specified combination of digits fits.

Answer: For example, $0.32 + 0.22 + 0.23 + 0.23 = 1$.

Recommendations for checking:

| is in the work | points |
| :--- | :--- |
| at least one correct example is provided | 7 points |
| in the absence of a correct example, there are correct conclusions about its structure (for example, the set of last digits is determined) | no more than 2 points |
| incorrect examples (in any number) | 0 points |