y=2x³+3x² x₀=3
yk=y₀+y'(x₀)*(x-x₀)
y₀=2*3³+3*3²=54+27=81.
y'(3)=6x²+6x=6*3²+6*3=54+18=72. ⇒
yk=81+72*(x-3)=81+72x-216=72x-135.
не совсем понимаю запись второй ф-ции
(6-y)(6+y)/(y-8)(y/(y-6)-2y/(y-6)^2)+12y/(y-6)=
=(6-y)(6+y)/(y+8)*(y^2-8y)/(y-6)^2+(12-y)/(y-6)=
=-y(6+y)/(y-6)+12y/(y-6)=(-6y-y^2+12y)/(y-6)=(6y-y^2)/(y-6)=y(6-y)/(y-6)=-y
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