Răspuns :
[(1/3-1/9)²+(1/3)³]:(1/3)⁴=
=[(2/9)²+(1/3)³]:(1/3)⁴=
=[4/81+1/27]:(1/3)⁴=
=7/81:1/81=
=7/81×81=
=7
[tex]\it \Big[\Big(\dfrac{^{3)}1}{\ 3}-\dfrac{1}{9}\Big)^2+\Big(\dfrac{1}{3}\Big)^3\Big]:\Big(\dfrac{1}{3}\Big)^4=\Big[\Big(\dfrac{2}{9}\Big)^2+\Big(\dfrac{1}{3}\Big)^3\Big]:\Big(\dfrac{1}{3}\Big)^4=\\ \\ \\ =\Big(\dfrac{4}{81}+\dfrac{^{3)}1}{\ 27}\Big):\dfrac{1}{81}=\dfrac{7}{81}\cdot\dfrac{81}{1}=7[/tex]