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Compose three simple arithmetic expressions from ten digits, using three of the four arithmetic operations of addition, subtraction, multiplication, and division. (In writing the expressions, only the signs of the three chosen arithmetic operations are allowed. Let's clarify this with an example. Consider three arithmetic expressions: $3+4=7,9-8=1,30 / 6=5$. This example cannot serve as a solution to the problem, since the digit 2 is missing, and the digit 3 is repeated twice.)

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The digit zero cannot act as a number in any of the four expressions using one of the arithmetic operations. Therefore, zero must form a number divisible by ten with one of the digits. We also note that three numbers connected by the addition operation can also be connected by the subtraction operation. The same applies to multiplication and division operations. Thus, there are only two possible scenarios: either you use two additive operations and one multiplicative, or two multiplicative and one additive.

## Solution

Here is one possible solution: $7+1=8,9-6=3,4 * 5=20$.