(208²-11²):219 =(43264-121):219=43143:219=197
(\|`6+2/ \|`6-2)-(\|`6-2/ \|`6+2)=
( (\|`6+2)^2 - (\|`6-2)^2 )/ (\|`6-2)(\|`6+2)=
(6+4\|`6 + 4 - 6 + 4\|`6 - 4) / 6-4=
8\|`6 / 2= 4\|`6
ответ: 4\|`6
F' (x) = (x^2 + 3)' √x + (√x) ' (x^2 + 3) =
= 2x*√x + (x^2 + 3) / (2√x)
B⁴-3b³-2b+6=b³(b-3)-2(b-3)=(b-3)(b³-2)
4у²-81=(2у+9)(2у-9)
а*в*с-д= 112*48*1.8-2.66=9676.8-2.66=9674.14