48000。

To solve the expression \\( 208 \\times 27 + 792 \\times 48 + 208 \\times 21 \\), you would perform each multiplication first, and then add the results together:

\\(208 \\times 27 = 5,616\\)

\\(792 \\times 48 = 38,016\\)

\\(208 \\times 21 = 4,368\\)

Now, add these results together:

\\(5,616 + 38,016 + 4,368 = 48,000\\)

So, \\( 208 \\times 27 + 792 \\times 48 + 208 \\times 21 = 48,000 \\).