Question

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Answer 1

$\frac{ {x}^{2} {y}^{2}( {x}^{2} + {y}^{2})}{10( - (x - y))} \times \frac{9(x - y)}{ {x}^{2} + {y}^{2} } = - \frac{9 {x}^{2} {y}^{2} }{10}$

$x = - 7 \: \: \: \: \: \: \: \: y = \frac{1}{7}$

$- \frac{9 \times {( - 7)}^{2} \times {( \frac{1}{7}) }^{2} }{10} = - \frac{9 \times { ( - 7)}^{2} \times {7}^{ - 2} }{10} = - \frac{9}{10}=-0.9$

Answer 2

$\boxed{ \frak{ \underline{\huge - 0.9}} }.$