Помогите пожалуйста. Заранее спасибо)))

1)
$128 x^{2} y^{3} ( \frac{1}{4} x y^{5} ) ^{3} =128 x^{2} y^{3}( \frac{1}{4} ) ^{3} x^{3}(y^{5}) ^{3}=2^{7} (4^{-1} )^{3}( x^{2} x^{3} ) y^{3} y^{5*3} = \\=2^{7}* 4^{-1*3} x^{2+3} y^{3} y^{15}=2^{7}* (2^{2})^{-3}x^{5}y^{3+15}=2^{7}*2^{2*(-3)}x^{5}y^{18}= \\ =2^{7}*2^{-6}x^{5}y^{18}=2^{7+(-6)}x^{5}y^{18}=2^{1}x^{5}y^{18}=2x^{5}y^{18}$

2)
$(-0,1 m^{3} n^{6})^{4}*(10 m^{2} n^{3} )^{5}=(-0,1)^{4}(m^{3})^{4} (n^{6})^{4}10^{5}(m^{2})^{5} (n^{3})^{5}=\\=(- \frac{1}{10})^{4}m^{3*4}n^{6*4}10^{5}m^{2*5}n^{3*5}=(10^{-1})^{4}m^{12}n^{24}10^{5}m^{10}n^{15}=\\=(10^{-1*4}*10^{5}) (m^{12}*m^{10})(n^{24}*n^{15})=10^{-4+5}m^{12+10}n^{24+15}=\\=10^{1}m^{22}n^{39}=10m^{22}n^{39}$

3)
$2 \frac{5}{8}x^{n-2}y^{m+4}( - \frac{16}{63}x^{n+5}y^{2m-3}) = \\ =(2 \frac{5}{8}*(- \frac{16}{63}))*(x^{n-2}*x^{n+5})(y^{m+4}*y^{2m-3})= \\ =- \frac{21}{8} * \frac{16}{63} *x^{n-2+n+5}y^{m+4+2m-3}= \\ =-\frac{21*16}{8*63} x^{2n+3}y^{3m+1}= - \frac{2}{3} x^{2n+3}y^{3m+1}$