11(1898, +2,52:07-80.0,4

1.

• \[ 1898 + 2.52 \approx 1900.52 \]
• \[ 1900.52 : 07 \approx 271.5 \]
• \[ 271.5 - 80.04 \approx 191.46 \]

2.

• \[ \log_{10}(0.015) \approx -1.82 \]
• \[ -1.82 + 0.075 \approx -1.745 \]
• \[ -1.745 \times 511 \approx -891.7 \]

Note: The provided numbers are interpreted as mathematical expressions. Calculations are approximate due to the nature of the input.