Question

Решить алгебраическое уравнение

Даю 79 баллов

Answer 1

Ответ:

на фото...................

Answer 2

Ответ:

$\displaystyle \Big(\frac{z^2}{z+5}-\frac{z^3}{z^2+10z+25}\Big):\Big(\frac{z}{z+5}-\frac{z^2}{z^2-25}\Big)=\\\\\\=\Big(\frac{z^2}{z+5}-\frac{z^3}{(z+5)^2}\Big):\Big(\frac{z}{z+5}-\frac{z^2}{(z-5)(z+5)}\Big)=\\\\\\=\frac{z^2(z+5)-z^3}{(z+5)^2}:\frac{z(z-5)-z^2}{(z-5)(z+5)}=\frac{5z^2}{(z+5)^2}\cdot \frac{(z-5)(z+5)}{-5z} =-\frac{z\, (z-5)}{z+5}=\\\\\\=\frac{z\, (5-z)}{z+5}=\frac{5z-z^2}{z+5}$