Вправи: 885

885. Спростіть вираз.

a) 0,2x^–2y • 5x²y^–2 = 1 • x⁰y^–1 = 1y;

б) (a^–1 + b^–1) • (a + b)^–1 = (1a + 1b) • 1a+b = b+aab • 1a+b = 1ab;

в) (m4n-29p)² • (m2n-33p)^–3 = m8n-481p2 • m-6n93-3p-3 = m8n9 • 27p381p2n4m6 = m2n5p3;

г) (a4b-3c5)^–3 • (c8ab3)² = a-12b9c-15 • c16a2b6 = b3 • c31a14.