Răspuns:
4.
[tex]( - \frac{3}{4} )^{5 \times 2} \div ( - \frac{3}{4} )^{12} = ( - \frac{3}{4} )^{ - 2} = \frac{1}{ (- \frac{ 3}{4})^{2} } = \frac{1}{ \frac{9}{16} } = \frac{16}{9} [/tex]
5.
[tex]3 {x}^{2} - 6x + 3 = 3( {x}^{2} - 2x + 1) = 3(x - 1)^{2} [/tex]
6.
[tex] \frac{1}{ \sqrt{2} - 1 } = \frac{ \sqrt{2} + 1}{2 - 1} = \sqrt{2} + 1[/tex]
[tex] \sqrt{2} + 1 - \sqrt{2} = 1 \: = > adevarat[/tex]
