а) -3v(v-c)(c+4v) = -3v(v^2-vc+4cv-4c) = -3v(v^2+3cv-4c)б) c(2+3c)(5c-1) = c(10c+15c^2-5c-3c^2) = c(-3c^2+15c^2+5c-10c) = c(12c^2-5c)в) (a+3v)(a-3v-1) = a(a-3v-1)+3v(a-3v-1) = a^2-3av-a+3av-9v^2-3v = a^2-4v^2-a-3vг) (7a-1)(a^2-5a+1) = 7a(a^2-5a+1)-1(a^2-5a+1) = 7a^3-35a^2+7a-a^2+5a-1 = 7a^3-36a^2+12a-1
а) -3v(v-c)(c+4v) = -3v(v^2-vc+4cv-4c) = -3v(v^2+3cv-4c)
б) c(2+3c)(5c-1) = c(10c+15c^2-5c-3c^2) = c(-3c^2+15c^2+5c-10c) = c(12c^2-5c)
в) (a+3v)(a-3v-1) = a(a-3v-1)+3v(a-3v-1) = a^2-3av-a+3av-9v^2-3v = a^2-4v^2-a-3v
г) (7a-1)(a^2-5a+1) = 7a(a^2-5a+1)-1(a^2-5a+1) = 7a^3-35a^2+7a-a^2+5a-1 = 7a^3-36a^2+12a-1