51-8×5-11

To solve the expression \( 51 - 8 \times 5 - 11 \), follow the order of operations (also known as PEMDAS/BODMAS):

1. Multiplication first: \[ 8 \times 5 = 40 \]

2. Substitute back into the expression: \[ 51 - 40 - 11 \]

3. Subtraction next from left to right: \[ 51 - 40 = 11 \] \[ 11 - 11 = 0 \]

So, the final result is: \[ \boxed{0} \]