Вправи: 279

279. Спростіть вираз:

1) 2a^–5b² • 3a^–2b^–5 = 6a^–7b^–3;

2) (12mn^–3)^–2 = (12)^–2 m^–2n⁶ = 4m^–2n⁶; 3) 3,6a2b0,9a3b-3 = 4b4a;

4) 0,8a^–6b⁸ • 5a¹⁰ • b^–8 = 4a⁴b⁰ = 4a⁴;

5) 25x-3y-4 • y45x-7 = 25x-3y4y-4 • 5x-7 = 5x4y81 = 5x⁴y⁸;

6) 28c³d^–2 • (2cd^–1)^–2 = 28c³d^–2 • 2^–2c^–2d² = 28 • 14 cd = 7c.