a) (a - 7)/(√a - √7) = (√a + √7) (√a - √7) /(√a - √7) = (√a + √7)
б) (х - 11√х)/(4√х - 44) = √х(√х - 11)/(4(√х - 11)) = (√х)/4
a) (a - 7)/(√a - √7) = (√a + √7) (√a - √7) /(√a - √7) = (√a + √7)
б) (х - 11√х)/(4√х - 44) = √х(√х - 11)/(4(√х - 11)) = (√х)/4
(√а-√7)(√а+√7)/(√а-√7)=√а-√7
б)(х-11√х)/(4√х-44)=√х(√х-11)/4(√х-11)=
√х/4