<span>1) 3z^2-27=0 </span>
<span> 3 z^2 = 27 </span>
<span> z^2 = 9 </span>
<span> z = 3 </span>
<span> z = -3 </span>
<span> Ответ : { 3, -3}</span>
<span><span>2) 16-4x^2=0 </span></span>
<span><span> 4 (4 - x^2) = 0 </span></span>
<span><span> 4 - x^2 = 0 </span></span>
<span><span> x = 2 </span></span>
<span><span> x = -2 </span></span>
Ответ : { 2, -2}
<span>3) 1-9z^2=0 </span>
<span> ( 1- 3z) (1+3z ) = 0 </span>
<span> 1 - 3z = 0 или 1+3z = 0 </span>
<span> - 3z= -1 3z = -1 </span>
<span> z = 1/3 z = - 1/3</span>
<span> Ответ : { 1/3 , - 1/3 }</span>
<span> </span>