To find the total weight of the two cases in decigrams, we first need to convert the weights from dekagrams to decigrams.
1 dekagram (dag) is equal to 100 decigrams (dg).
Now, let's convert the weights:
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For the tomato cans: \[ 563 \text{ dag} \times 100 \text{ dg/dag} = 56,300 \text{ dg} \]
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For the soup cans: \[ 458 \text{ dag} \times 100 \text{ dg/dag} = 45,800 \text{ dg} \]
Now, we add the two weights together:
\[ 56,300 \text{ dg} + 45,800 \text{ dg} = 102,100 \text{ dg} \]
Therefore, the total weight of the two cases together is 102,100 decigrams.