687*38-25*71*2²+313*38

To solve the expression \( 687 \times 38 - 25 \times 71 \times 2^2 + 313 \times 38 \), we will begin by calculating each term step by step. 1. **Calculate \( 687 \times 38 \)**: \[ 687 \times 38 = 26094 \] 2. **Calculate \( 2^2 \)**: \[ 2^2 = 4 \] 3. **Calculate \( 25 \times 71 \times 4 \)**: \[ 25 \times 71 = 1775 \] \[ 1775 \times 4 = 7100 \] 4. **Calculate \( 313 \times 38 \)**: \[ 313 \times 38 = 11994 \] Now we can substitute these values back into the original expression: \[ 26094 - 7100 + 11994 \] 5. **Perform the subtraction and addition**: \[ 26094 - 7100 = 18994 \] \[ 18994 + 11994 = 30988 \] Thus, the final result of the expression \( 687 \times 38 - 25 \times 71 \times 2^2 + 313 \times 38 \) is: \[ \boxed{30988} \]