Вправи 401 - 467 » 406

406. Винесіть за дужки а–4: 1) a–12 + a–10 + a–4(a–12–(–4) + a–10–(–4)) = a–4(a–8 + a–6); 2) a–7 – a3 = a–4(a–7–(–4) – a3–(–4)) = a–4(a–3 – a7); 3) a–4 – a4 + a–6 = a–4(1 – a4–(–4) + a–6–(–4)) = a–4 • (1 – a8 + a–2); 4) 7a–14 + 6 = a–4(7a–14–(–4) + 6 : a–4) = a–4 • (7a–10 + 6a4); 5) 3a–1 + 5/a^5 = 3a–1 + 5a–5 = a–4(3a–1–(–4) + 5a–5–(–4)) = a–4(3a3 + 5a–1); 6) 4 + 1/a + 1/a^(-3) = 4 + a–1 + a3 = a–4(4 : a–4 + a–1–(–4) + a3–(–4)) = a–4(4a4 + a3 + a7).