Question

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Answer 1

Ответ:

$1) (x-2)\sqrt{\frac{1}{x^2-4x+4} } =(x-2)\sqrt{\frac{1}{(x-2)^2} } =(x-2)\frac{1}{(x-2)}=1$

$2) (5-y)\sqrt{\frac{25}{y^2-10y+25} }=(5-y)\sqrt{\frac{25}{(y-5)^2} }=(5-y)\frac{5}{y-5}=-(y-5)\frac{5}{y-5}= -5$