1:6 - 56/6
2:5 - 112/5
3:5 - 168/5
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54х²-6(х³-9х²+27х-27)=162+6х³
54х²-6х³+54х²-162х+162=162+6х³
54х²-6х³+54х²-162х=6х³
108х²-6х³-162х=6х³
18х²-х³-27х=х³
18х²-х³-27х-х³=0
18х²-2х³-27х=0
х(18х-2х²-27)=0
х=0
18х-2х²-27=0
х=0
х=9+3√3/2
х=9-3√3/2
Ответ х1=0,х2=9-3√3/2,х3=9+3√3/2
Sin(73) = sin(90 - 17) = cos(17)
sin^2(17) + cos^2(17) = 1
sin^2(45) = 1/2
1 + 1/2 = 1.5 - ответ D