3) 29271 : 33 - 95120: 145 - 5 • 29 + 517; 4) 91808 : (67076 - 59989 - 7081 + 19994 - 19696)

Let's break down the expressions step by step.

For the first expression:

29271 : 33 - 95120 : 145 - 5 • 29 + 517

1. Perform the divisions:
   • \( 29271 \div 33 \)
   • \( 95120 \div 145 \)

Calculating those:

• \( 29271 \div 33 \approx 886.82 \)
• \( 95120 \div 145 \approx 656.69 \)

2. Next, we apply the rest of the operations:
   • Subtract the second quotient from the first:
   • Then perform the multiplication:
   • Finally, add 517.

So now we have:

• \( 886.82 - 656.69 - (5 \times 29) + 517 \)

Calculating further:

• \( 5 \times 29 = 145 \)
• Now substitute back:
• \( 886.82 - 656.69 - 145 + 517 \)

3. Compute step-by-step:
   • \( 886.82 - 656.69 = 230.13 \)
   • \( 230.13 - 145 = 85.13 \)
   • \( 85.13 + 517 = 602.13 \)

So the result of the first expression is approximately 602.13.

For the second expression:

91808 : (67076 - 59989 - 7081 + 19994 - 19696)

1. Calculate the operations inside the parentheses:

   • First, handle the subtraction and addition:

   \( 67076 - 59989 = 7087 \)

   \( 7087 - 7081 = 6 \)

   \( 6 + 19994 = 20000 \)

   \( 20000 - 19696 = 304 \)

2. Now perform the division:
   \( 91808 \div 304 \)

Calculating that:

• \( 91808 \div 304 \approx 302.65 \)

So the result of the second expression is approximately 302.65.

Final Answers:

1. First Expression: 602.13
2. Second Expression: 302.65