Question

Сократите дробь help... ​

Answer 1

Объяснение:

$1)\ \frac{x^2-13}{x-\sqrt{13} }=\frac{(x-\sqrt{13})*(x+\sqrt{13})}{x-\sqrt{13}} =x+\sqrt{13} .\\2)\ \frac{\sqrt{x} +11}{x-121}=\frac{\sqrt{x} +11}{(\sqrt{x} +11)*(\sqrt{x} -11)}=\frac{1}{\sqrt{x} -11}.\\3)\ \frac{b-5\sqrt{b} }{b-25} =\frac{\sqrt{b}*(\sqrt{b}-5) }{(\sqrt{b} -5)*(\sqrt{b}+5) } =\frac{\sqrt{b} }{\sqrt{b}+5 } .\\4)\ \frac{15+\sqrt{15} }{\sqrt{15} }=\frac{\sqrt{15}*(\sqrt{15}+1) }{\sqrt{15} } =\sqrt{15}+1.$