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Пошаговое объяснение:
f=5; s=√20
(s-f)/(f²+s²) ·((f+s)/f -(2f)/(f-s))=(s-f)/(f²+s²) ·((f+s)(f-s)-2f²)/(f(f-s))=(2f²-(f²-s²))/(f(f²+s²))=(f²+s²)/(f(f²+s²))=1/f=1/5=0,20