Question

3) c-5 : c-5 = ?
____ ____
c²-4c 5c-20

Answer 1

Ответ:

$\displaystyle \frac{5}{c}$

Объяснение:

$\displaystyle \frac{c-5}{c^2-4c}:\frac{c-5}{5c-20}=\frac{c-5}{c(c-4)}:\frac{c-5}{5(c-4)}=\\\\\\\frac{c-5}{c(c-4)}\cdot \frac{5(c-4)}{c-5}=\frac{5}{c}$