sin(3x-5x)=-1 sin(-2x)=-1 -sin2x=-1 sin 2x==1
2x=π/2+2πn. n∈Z
x=π/4+πn. n∈Z
<span>(11/8 - 1 7/11 )*2,2=-6,325</span>
4cˇ2 -0,25=0
4cˇ2 = 0,25
cˇ2 = 0.25/4
c = 0,5/2 i c =-0,5/2
3lg(x - 3) = lg(x³ - 63)
lg(x - 3)³ = lg(x³ - 63)
x³ - 9x² + 27x - 27 = x³ - 63
-9x² + 27x + 36 = 0
x² - 3x - 4 = 0
x1 = -1
x2 = 4
OTVET: 4