Сократите дробь:1)3a-9/a^2-9=2)81n^2-64m^2/81n^2-144nm+64m^2=3)x^4-16/x+2=

1)[latex]\frac{3a^{2}-9}{a^{2}-9}=\frac{3(a-3)}{(a-3)(a+3)}=\frac{3}{a+3}[/latex]   2)[latex]\frac{81n^{2}-64m^{2}}{81n^{2}-144mn+64m^{2}}=\frac{(9n-8m)(9n+8m)}{(9n-8m)^{2}}=\frac{9n+8m}{9n-8m}[/latex]   3)[latex]\frac{x^{4}-16}{x+2}=\frac{(x-2)(x+2)(x^{2}+4)}{x+2}=(x^{2}+4)(x-2)[/latex]