Можете помочь, пожалуйста.

$4(3 - \frac{2}{5} x) - 2(0.6x + \frac{3}{4} ) = 12 - \frac{8}{5}x - 1.2x - \frac{6}{4} = \\ = 12 - 1.6x - 1.2x - 1.5 = 10.5 - 2.8x$
Ответ 3)

$\frac{27 ^{2}\times {( {3}^{4}) }^{4} }{(9 \times 27 ^{3} )^{3} } = \frac{27 ^{2}\times {3}^{16} }{9 ^{3} \times 27 ^{9} } = \frac{27^{2} \times {3}^{16} }{( {3}^{2} )^{3} \times 27 ^{9} } = \frac{27 ^{2} \times {3}^{16} }{{3}^{6} \times 27 ^{9} } = \frac{ {3}^{10} }{ {27}^{7 } } = \frac{ {3}^{10} }{ ({3}^{3})^{7} } = \frac{ {3}^{10} }{ {3}^{21} } = \frac{1}{ {3}^{11} }$