Časť:
Project ID:
2010000807
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
Za predpokladu, že \(x\neq 0\), \(y\neq 0\), \(x\neq -y\), zjednodušte výraz.
\[ { \frac{1} {y^{2}} - \frac{1} {x^{2}} \over -\frac{1} {x} - \frac{1} {y}} \]
\(\frac{y-x}
{xy} \)
\(\frac{x-y}
{xy} \)
\(x-y\)
\(y-x\)