В числителе квадрат суммы: (3,17+5,54)^2/8,71=8,71^2/8,71=8,71
Tg(29π/6)=tg(30π/6 - π/6) = tg(5π -π/6) = tg(π- π/6) = -tg(π/6) = -√3/3
<span> 4х-3(х-7)=2х+15</span>
<span>4х-3х+21=2х+15</span>
<span>-Х=15-21</span>
<span>х=6</span>
-58,06 (если 81/2)
86,58 (если 8 целых и 1/2)