Вправи 301 - 400 » 330

330. Запишіть як степінь з основою 7: 1) (7^(-7) • 7^4)/7^(-9) = 7^(-3)/7^(-9) = 7–3–(–9) = 76; 2) (7^(-8) • 7^11)/7^10 = 7^3/7^10 = 73–10 = 7–7; 3) (7^(-1) • 7^12)/7^(-4) = 7^11/7^(-4) = 711–(–4) = 715; 4) (7^(-3) • 7^12)/(7^10• 7^(-8) ) = 7^9/7^2 = 79–2 = 77; 5) (7^(-8) • 7^5)/(7^(-4)• 7^(-8) ) = 7^(-3)/7^(-12) = 7–3–(–12) = 79; 6) (7^(-16) • 7^15)/(7^9• 7^(-8) ) = 7^(-1)/7^1 = 7–1–1 = 7–2 = 1/7^2 = 1/49.