Завдання 139 - 300 » 299

Спростіть вираз: 1) 20a8 ∙ (9a)2 = 208 ∙ 81a2 = 1620a10; 2) (–b5)4 ∙ 12b6 = b20 ∙ 12b6 = 12b26; 3) (3m6n3)4 ∙ (–1/81m9n) = 81m24n12 ∙ (–1/81m9n) = –m33n13; 4) (0,2x7y8)3 ∙ 6x2y2 = 0,008x21y24 ∙ 6x2y2 = 0,048x23y26; 5) (–1/2ab4)3 ∙ (4a6)2 = –1/8a3b12 ∙ 16a12 = –2a15b12; 6) (–2/3x2y)5 ∙ (–3/4xy2)2 = –32/243x10y5 ∙ 9/16x2y4 = –2/27x12y9.