Verified answer

Ответ:

a) [tex]= a^{8} *a^{7}[/tex]

б) [tex]=9x^{7} y^{5} x^{3} y^{7}=9x^{10}y^{12}[/tex]

в) [tex]=y^{-16} /y^{5} =yx^{-21} =\frac{1}{y^{21} }[/tex]

г)[tex]= 4x^{8} y^{5}*7x^{2} y^{-4}x^{3} y^{-3}=28x^{13} y^{-2}=28x^{13} *\frac{1}{y^2} =\frac{28x^{13} }{y^{2} }[/tex]