Hasil dari gambar di atas no 15???

[tex] \frac{ \frac{x}{y} - \frac{y}{x} }{ \frac{2y}{x} - \frac{2x}{y} } \\ = \frac{ \frac{x ^{2} - y ^{2} }{xy} }{ \frac{2y ^{2} - 2x ^{2} }{xy} } \\ = \frac{x ^{2} - y ^{2} }{xy} \div \frac{2y ^{2} - 2x ^{2} }{xy} \\ = \frac{x ^{2} - y ^{2} }{xy} \times \frac{xy}{2y ^{2} - 2x ^{2} } \\ = \frac{1}{1} \times \frac{1}{ - 2} \\ = - \frac{1}{2} [/tex]
Jawaban : b. - ½

Maaf Kalau Salah