(1 5/6х+3 1/4)×1 3/19=16,5

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To solve this, we first need to multiply the mixed numbers by converting them into improper fractions.

1 5/6 = (61+5)/6 = 11/6
3 1/4 = (43+1)/4 = 13/4
1 3/19 = (19*1+3)/19 = 22/19

Now, we can multiply the improper fractions:

(11/6 + 13/4) 22/19 = (154/24) (22/19) = 77/6 * 22/19 = 1694/114 = 847/57

Therefore, the result of (1 5/6 3 1/4) 1 3/19 is 847/57 or approximately 14.89.