а) 3a³ * 7a² = 21a^(3+2) = 21a^5
б) b⁴ * 5b^8 = 5b^(4+8) = 5b^12
в) 9x (-4x)^5 = 9x (-1024x^5) = -9216x^6
а) 3a³ * 7a² = 21a^(3+2) = 21a^5
б) b⁴ * 5b^8 = 5b^(4+8) = 5b^12
в) 9x (-4x)^5 = 9x (-1024x^5) = -9216x^6