3x-2≥0,3x≥2,x≥2/3
x+2>0,x>-2
x≥2/3
x принадлежит [2/3;беск.)
X(x²-6x+8) =0; x=0; x²- 6x +8=0; x= 4; x= 2; отв: 0;2;4.
6cosx-3=0
6cosx=3
cosx=1/2
<span>x=+-pi/3 + 2 pi n</span>
32/27;16/9.... b1=32/27
b2/b1=q=16/9*27/32= 3/2
s6=(32/27)(q⁶-1)/(q-1)
s6= (32/27)(729/64-1)/(3/2-1)=2*32/27*665/64=665/27=24 17/27