4cos²x -3 ≥ 0 ;
4*(1+cos2x)/2 -3 <span>≥ 0 ;
2 +2cos2x -3 </span>≥ 0 ⇔ cos2x <span>≥ 1/2
</span> 2πn -π/6 ≤ 2x ≤ π/6 + 2πn ,n∈Z
πn <span>-π/12 ≤ </span>x ≤ π/12 + πn ,n<span>∈Z
</span>
иначе x ∈[ πn -π/12 ; π/12 + πn ] ,n<span>∈Z</span>
250/100(%)=2.5
2.5*40=100
250-100=150кг
Ответ: 150кг
наименьшее значение: ( -3, 7 )
2^0^2+4^0-3=0+0-3=-3
2^2^2+4^2-3=7
2а*6а^2+ b/3a = 2*0.5 * 6*0.5^2 + (-3/4) / 3*0.5 = 1 * 6*0.25 + (-3/4)*1.5 =
= 1.5 + (-3/4)*1.5 = 1.5 (1 - 3/4) = 1.5* (1/4) = 1.5*.25=0.375