Question

Помогите срочно !!!!!!!!!

Answer 1

$\displaystyle\bf\\\frac{y^{2}-8y+16 }{y^{2}-16 }:\frac{10y-40}{y^{2}+4y } =\frac{(y-4)^{2} }{(y-4)\cdot(y+4)} :\frac{10\cdot(y-4)}{y\cdot(y+4)} =\\\\\\=\frac{y-4}{y+4} :\frac{10\cdot(y-4)}{y\cdot(y+4)} = \frac{y-4}{y+4} \cdot\frac{y\cdot(y+4)}{10\cdot(y-4)} = \frac{y}{10} \\\\\\y=60\\\\\\\frac{y}{10} =\frac{60}{10} =6\\\\\\Otvet \ : \ 6$