<span>12-4*</span>√(6 <span>1/4)=
12-4*</span>√(25/4)=
12-4*(√25/√4)=
12-4*(5/2)=
12-((4*5)/2)=
12-20/2=
12-10 = 2
А) (2x-16)^2 = 4x^2 - 64x + 256
б) (3a+c)^2 = 9a^2 + 6ac + c^2
в ) (y + 5)(y - 5) =y^2 - 5y + 5y - 25 = y^2 - 25
г) (4b+ 5c)(4b -5c) = 16b^2 - 20bc + 20 bc -25c^2 = 16b^2 - 25c^2