5. (5 points) Fill in the blanks in the following formula with the numbers $1, 2, 3, 4, 5, 6$ to make the equation true.



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【Answer】Solution: According to the problem, the results of the three equations are all perfect squares. Since $2 \times 2=4, 5 \times 5=25, 19$ $\times 19=361$,

the six numbers filled into the blanks are, in order, $4,2,5,3,6,1$.