Question

Đưa thừa số vào trong dấu căn:

a) \(-\frac{a}{b}\sqrt{\frac{b}{a}}\left(a>0,b>0\right)\)

b)\(\frac{1}{2x-1}\sqrt{5-20x+20x^2}\)  (x> \(\frac{1}{2}\)

c) \(\left(x-5\right)\sqrt{\frac{3}{25-x^2}}\)

d) \(\frac{x}{x-y}\sqrt{\frac{x-y}{x}}\)

Answer 1

a)\(=-\sqrt{\left(\frac{a}{b}\right)^2\cdot\frac{b}{a}}\)

\(=-\sqrt{\frac{a^2}{b^2}\cdot\frac{b}{a}}\)

\(=-\sqrt{\frac{a}{b}}\)

Answer 2

b) \(=\sqrt{\left(\frac{1}{2x-1}\right)^2\cdot5\left(4x^2-4x+1\right)}\)

\(=\sqrt{\frac{5}{\left(2x-1\right)^2}\cdot\left(2x-1\right)^2}\)

\(=\sqrt{5}\)

Answer 3

c)\(=\sqrt{\left(x-5\right)^2\cdot\frac{-3}{\left(x-5\right)\left(x+5\right)}}\)

\(=\sqrt{\frac{-3\left(x-5\right)}{x+5}}\)

\(=\sqrt{\frac{15-3x}{x+5}}\)

Answer 4

d)\(=\sqrt{\left(\frac{x}{x-y}\right)^2\cdot\frac{\left(x-y\right)}{x}}\)

\(=\sqrt{\frac{x^2}{\left(x-y\right)^2}\cdot\frac{x-y}{x}}\)

\(=\sqrt{\frac{x}{x-y}}\)

Answer 5

Cảm ơn bạn nha!!!

Answer 6

Thanks nha!!!!

Answer 7

Cảm ơn nhìu nha!!!!!

Answer 8

Cảm ơn!!!

Answer 9

uk ko có j đâu bn 

 

Answer 10

kcj 

Answer 11

uk