1) 2х ∙ 2х ∙ 2х ∙ 2х = (2х)^4=16х^4
2) (– 1/3а²с) ∙ (– 1/3а²с) ∙ (– 1/3а²с)=
(– 1/3а²с) ^ 3= -1/9а^6с^3
3)0,1х²у^5 ∙ (–0,1х²у^5 ) ∙ 0,1х²у^5 ∙ (–0,1х2у5 ) = (0,1х²у^5)^2 × (–0,1х²у^5 )^2= 0.01х^4 у^10 ×(0.01 х^4 у^10) =(0.01х^4 у^10)^2 = 0.0001х^8у^20
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х^5=-1
х = -1
х^3-27 = 0
х^3 = 27
х = 3
6 + х^3 = -2
х^3 = -2-6
х^3 = -8
х = -2
1/5 х^9 + 3 = 3
1/5х^9=0
x=0