РОЗДІЛ 3. Квадратні корені. Дійсні числа » 635 (4-10)

4) (√cd+ √cb)/(√ad+ √ab) = (√c(√d+ √b))/(√a(√d+ √b)) = √c/√a; 5) √x/(x-√x ) = √x/(√x(√x- 1)) = 1/(√x- 1); 6) (a+5√a)/√a = (√a(√a+ 5))/√a = √a + 5; 7) (2√m)/(m- √m) = (2√m)/(√m(√m- 1)) = 2/(√m-1); 8) (√2 x+ √2y)/(x+y) = (√2(x+y))/(x+y) = √2; 9) (√8x+ √8y)/(√2x+√2y) = (√8(√x+ √y))/(√2(√x+ √y) = √4/1 = 2; 10) (√3a- √3b)/(√27a- √27b) = (√3(√a- √(b)))/(√27(√a- √b)) = 1/√9 = 1/3;