Answer:
To perform this calculation, we need to first add the two decimal numbers on the left-hand side of the expression, and then add the resulting sum to the exponential number on the right-hand side.
(3.984375 × 10^-1 + 3.4375 × 10^-1) + 1.771 × 10^3
= 0.3984375 + 0.34375 + 1771
= 1771.7421875
Therefore, (3.984375 × 10^-1 + 3.4375 × 10^-1) + 1.771 × 10^3 = 1771.7421875.