85717800•9= 1879•79= 80:9= 5000:1000= 34500:100=

Here are the calculations for each of the expressions:

1. \( 85717800 \times 9 = 771460200 \)
2. \( 1879 \times 79 = 148921 \)
3. \( 80 \div 9 \approx 8.8889 \) (repeating)
4. \( 5000 \div 1000 = 5 \)
5. \( 34500 \div 100 = 345 \)

Let me know if you need any further assistance!