5. (3 points) Use the 10 digits from $0 \sim 9$ to form several composite numbers, with each digit used exactly once. The minimum value of the sum of these composite numbers is $\qquad$

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【Solution】Solution: To make the sum of composite numbers the smallest, of course, they should all be the smallest single-digit numbers, but $0, 1, 2, 3, 5, 7$ are not composite numbers,

so we make the tens digit as small as possible, forming numbers as $1 \square, 2 \square, 3 \square$, the specific composite numbers are $15, 27, 35$, thus the sum of these six composite numbers is: $4+6+8+9+10+27+35=99$;

Answer: The minimum value of the sum of these composite numbers is 99.
Therefore, the answer is: 99.