a) To calculate 3,458 * 100 - 19,27, we first multiply 3,458 by 100, and then subtract 19.27 from the result.

3,458 * 100 = 345,800
345,800 - 19.27 = 345,780.73

Therefore, a) 3,458 * 100 - 19,27 = 345,780.73

b) To calculate 0.7695 x 1000 + 175.96, we first multiply 0.7695 by 1000, and then add 175.96 to the result.

0.7695 x 1000 = 769.5
769.5 + 175.96 = 945.46

Therefore, b) 0.7695 x 1000 + 175.96 = 945.46

c) To calculate 370.5 - 2.659 * 100, we first multiply 2.659 by 100, and then subtract the result from 370.5.

2.659 * 100 = 265.9
370.5 - 265.9 = 104.6

Therefore, c) 370.5 - 2.659 * 100 = 104.6

d) To calculate 512,500 - 14.6 * 1000, we first multiply 14.6 by 1000, and then subtract the result from 512,500.

14.6 * 1000 = 14,600
512,500 - 14,600 = 497,900

Therefore, d) 512,500 - 14.6 * 1000 = 497,900