Question

Trục căn thức ở mẫu:

a) $\dfrac{1}{\sqrt{a}+b}$;

b) $\dfrac{2}{\sqrt{a}-\sqrt{b}}$;

c) $\dfrac{3}{2 \sqrt{a}+1}$;

d) $\dfrac{2 x y}{2 \sqrt{x}+3 \sqrt{y}}$.

Answer 1

a, căn a trừ b/ a-b^2

b, 2 căn a + 2 căn b /a-b

c, 6 căn a trừ 6 / 4a-1

 

Answer 2

a) căn a-b/a-b^2

b) 2(căn a+căn b)/a-b

c) 3(2 căn a-1)/4a-1

d)2xy(2 căn x-3 căn y)/4x-9y

Answer 3

a) √a -b /a-b²

b) 2√a+2b / a-b²

c) 6√a -3 / 4a-1

d) 4xy√x -6xy√y / 4x-9y

Answer 4

a) (√a-b)/(a-b^2)

b) (2(√a+√b))/(a-b)

c) (3(2√a-1))/(4a-1)

d) (2xy(2√x-3√y))/(4x-9y)

Answer 5

a. \(\dfrac{\sqrt{a-b}}{a-b^2}\)

b. \(\dfrac{2\left(\sqrt{a-b}\right)}{a-b^2}\)

c. \(\dfrac{3\left(2\sqrt{a-1}\right)}{4a-1}\)

d. \(\dfrac{2xy\left(2\sqrt{x}-3\sqrt{y}\right)}{4x-9y}\)

Answer 6

a) can a-b/a-b^2

b) 2 ( can a+can b)/ a-b

c) 3( 2 can a-1)/4a-1

d)2xy(2canx-3 can y)/4x-9y