Tg420° = tg(360° +60)° = tg60° = √3
наш пример:
-50√3 * tg420° = -50√3*√3 = -50*3 = - 150
∛ 5X = 10
( ∛ 5X ) ^ 3 = 10 ^ 3
5X = 1000
X = 200
1)15,30,45,60,75,90-6
2)а)21,42,63,84-4
б)35,70-2
<span>(5-60:1)(5-60:2)(5-60:3)...(5-60:30)=(5-60)(5-30)(5-20)...(5-2)=(-55)(-25)(-15)...3
-20625<3</span>
(a+6)^3 - (2a^2+1)(3a-1) =а^3+18а^2+108а+216-(6а^3-2а^2+3а-1)=а^3+18а^2+108а+216-6а^3+2а^2-3а+1=
-5а^3+20а^2+105а+217