4.
(√x +5)/(x-25)=(√x +5)/((√x -5)(√x +5))=1/(√x -5)
(√3 -3)/(√5 -√15)=(√3 •(1-√3))/(√5 •(1-√3))=√(3/5)=√0,6
(x-2√(5x) +5)/(x-5)=((√x -√5)^2)/((√x -√5)(√x +√5))=(√x -√5)/(√x +√5)
5.
5/√15=(5√15)/15=(√15)/3=√(5/3)
5/(3√10)=(5√10)/(3•10)=(√10)/6=√(5/18)
8/(√6 +√2)=(8(√6 -√2))/((√6 +√2)(√6 -√2))=(8(√6 -√2))/(6-2)=(8(√6 -√2))/4=2(√6 -√2)=√24 -√8 или 2√2 •(√3 -1)
4.
(√x +5)/(x-25)=(√x +5)/((√x -5)(√x +5))=1/(√x -5)
(√3 -3)/(√5 -√15)=(√3 •(1-√3))/(√5 •(1-√3))=√(3/5)=√0,6
(x-2√(5x) +5)/(x-5)=((√x -√5)^2)/((√x -√5)(√x +√5))=(√x -√5)/(√x +√5)
5.
5/√15=(5√15)/15=(√15)/3=√(5/3)
5/(3√10)=(5√10)/(3•10)=(√10)/6=√(5/18)
8/(√6 +√2)=(8(√6 -√2))/((√6 +√2)(√6 -√2))=(8(√6 -√2))/(6-2)=(8(√6 -√2))/4=2(√6 -√2)=√24 -√8 или 2√2 •(√3 -1)