Вправи 301 - 400 » 320

320. Спростіть вираз: 1) a–4 • a–8 = a–4+(–8) = a–12; 2) a4 • a–8 = a4+(–8) = a–4; 3) a–4 • a8 = a–4+8 = a4; 4) a4 • a8 = a4+8 = a12; 5) a–5 • a5 = a–5+5 = a0 = 1; 6) a–12 • a6 • a–1 = a–12+6+(–1) = a–7; 7) a5 • a–6 • a–9 = a5+(–6)+(–9) = a–10; 8) a–7 • a • a7 = a–7+1+7 = a1 = a; 9) a0 • a3 • a–10 = 1 • a3+(–10) = a–7; 10) a–8 • a9 • a–3 • a2 = a–8+9+(–3)+2 = a0 = 1; 11) a–15 • a9 • a–1 • a15 = a–15+9+(–1)+15 = a8; 12) a–10 • a0 • a–6 • a24 = a–10 • 1 • a–6 • a24 = a–10+(–6)+24 = a8.