Respuesta:
[tex]7a^{3}-17a^{2}+4a-1\\12m^{2}n - 2mn^{2}-9mn\\ \frac{1}{5} x^{2}+\frac{1}{5}x+\frac{9}{5}\\ 8n^{3}+10m^{2}-4mn\\ 2x^{2}y-15xy^{2}-11xy\\ \frac{6}{3}x^{a}-\frac{6}{3}x^{a+1}=2x^{a}-2x^{a+1} = 2(x^{a}-x^{a+1})[/tex]
