Question

Помогите пожалуйста!

Answer 1

Объяснение:

$x = (0.5)^{ - 1} = ( frac{1}{2} )^{ - 1} = ( frac{2}{1})^{1} = 2$

$frac{5 {x}^{ - 2} }{4 - {x}^{ - 2} } - frac{5 {x}^{ - 2} }{4 + {x}^{ - 2} } = \ = frac{ {5(2)}^{ - 2} }{4 - ( {2})^{ - 2} } - frac{5 {(2)}^{ - 2} }{4 + {(2)}^{ - 2} } = \ = frac{ frac{5}{4} }{4 - frac{1}{4} } - frac{ frac{5}{4} }{4 + frac{1}{4} } = \ = frac{ frac{5}{4} }{ frac{15}{4} } - frac{ frac{5}{4} }{ frac{17}{4} } = frac{5 times 4}{4 times 15} - frac{5 times 4}{4 times 17 } = \ = frac{1}{3} - frac{5}{17} = frac{17 - 15}{51} = frac{2}{51}$