Во 2 в ответе последнее не "положительным", а "неотрицательным" напиши
A1=-6 a2=-2
d=a2-a1=-2+6=4
a16=a1+15d=-6+60=54
-10x/3-8/x=-30-9-8/x^2=-30x^2-58/9x^2
<span>..корни уравнения sin(3x-Π/6)=1/2,
3x=π/6+(-1)^n*π/6+πn
x=π/18+</span><span>(-1)^n*π/18+πn/3
n=0 x=</span><span>π/18
n=1 x=</span>π/18+π/3-π/18=π/3
n=-1 x=π/18+π/3+π/3=2π/3+π/18=13π/18
n=2 x=π/18+2π/3+2π/18=π/6+2π/3=5π/6
n=-2 x=π/18-2π/3-π/9=-π/18-2π/3=-11π/3<-π
n=3 x=π/18+π-π/3=19π/18-6π/18=13π/18
n=4 x=π/18+4π/3+4π/18=29π/18 бл. π
π/3 13π/18 5π/6
Корень уравнения равен -10