Question

(3b-8)(8b+3)-8b(3b-8) при b=-5,2
Решите пжлст с:

Answer 1

$(3b-8)(8b+3)-8b(3b-8)=(3b-8)(8b+3-8b)=(3b-8)\cdot 3=\\\\=3(-15,6-8)=-70,8$