четвёртый
Объяснение:
(c+17d)²-(17c+d)²=(c+17d-(17c+d))(c+17d+17c+d)=(c+17d-17c-d)(18c+18d)=(16d-16c)•18(c+d)=16•18(c+d)(d-c)=288(-c+d)(c+d)
четвёртый
Объяснение:
(c+17d)²-(17c+d)²=(c+17d-(17c+d))(c+17d+17c+d)=(c+17d-17c-d)(18c+18d)=(16d-16c)•18(c+d)=16•18(c+d)(d-c)=288(-c+d)(c+d)