Question

зная что x/y=3 найти x²-y²/xy​

Answer 1

$\frac{ {x}^{2} - {y}^{2} }{xy} = \frac{ {x}^{2} \div {y}^{2} - {y}^{2} \div {y}^{2} }{xy \div {y}^{2} } = \frac{ {x}^{2} \div {y}^{2} - 1 }{ x \div y} = \frac{ {3}^{2} - 1 }{3} = \frac{8}{3}$