1) 7÷2=x
×= 3,5
2) 0÷2=×
x= 0
третье дибилизм
(5х+3)² = 5х+3
25х²+9 = 5х+3
25х²-5х = 3-9
25х²-5х=-6
25х²-5х-6 = 0
D=b²-4ac = (-5)² - 4*25*(-6)
D=25+600=625
x₁=-b+√D/2a = 5+25/50=0,6
x₂=-b-√D=5-25/50=-0,4
<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
cos(2x-П/6)>-1/<span>√</span>2