Question

Можете помочь,прошуу?

Answer 1

$( frac{ x^{2} -5x}{ x^{2} -10x+25} + frac{25}{ x^{2} -25})cdot frac{5+x}{125- x^{3} } = \ =( frac{x(x-5)}{(x-5) ^{2} }+ frac{25}{(x-5)(x+5)} )cdot frac{5+x}{125- x^{3} } = \ =( frac{x}{(x-5)} + frac{25}{(x-5)(x+5)} )cdot frac{5+x}{125-x ^{3} }= \ = frac{x(x+5)+25}{(x-5)(x+5)} cdot frac{5+x}{(5-x)(25+5x+ x^{2} )}= frac{ x^{2} +5x+25}{(x-5)(5-x)(25+5x+ x^{2} )} = \ = frac{1}{-25- x^{2} } =- frac{1}{ x^{2} +25}$

Answer 2

спасибо большое с: