Ответ:

Решение:

  1. 1) 75 · 7-7 = 75+(-7) = 7-2 = \(\frac{1}{7^2}\) = \(\frac{1}{49}\)

  2. 2) 10-12 · 1015 = 10-12+15 = 103 = 1000

  3. 3) 5-12 : 5-16 = 5-12-(-16) = 5-12+16 = 54 = 625

Ответ: 1) \(\frac{1}{49}\); 2) 1000; 3) 625.