Tìm x

a,\(\sqrt{\left(2x-1\right)^2}-x=3\)

b,\(\sqrt{3x-6}-x=-2\)

Tìm x

a,\(3\sqrt{8x}-\sqrt{32x}+\sqrt{50x}=21\)

b,\(\sqrt{25x+50}+3\sqrt{4x+8}-2\sqrt{16x+32}=15\)

c,\(\sqrt{x^2-6x+9}-3=5\)

Rút gọn

A=\(\dfrac{a^2-9}{12}:\sqrt{\dfrac{a^2+6a+9}{16}}\) với a<2

B=\(\dfrac{1}{2a-1}\sqrt{5a^4\left(1-2a+4a^2\right)}\)

Rút gọn

A=\(\sqrt{\left(a-3\right)^2}-3a\) với a<3

B=\(4a+3-\sqrt{\left(2a-1\right)^2}\) với a>\(\dfrac{1}{2}\)

c=\(\dfrac{4}{a^2-4}\sqrt{\left(a-2\right)^2}\) với a<2

Tính

A=\(\sqrt{20}-10\sqrt{\dfrac{1}{5}}+\sqrt{\left(\sqrt{5}-1\right)^2}\)

B=\(2\sqrt{32}+5\sqrt{8}-4\sqrt{32}\)

C=\(\sqrt{6+2\sqrt{5}}-\sqrt{9-4\sqrt{5}}\)

D=\(\sqrt{\dfrac{10}{\sqrt{3}-1}}-\dfrac{55}{2\sqrt{3}+1}\)

Giari ptr

\(\sqrt{4x-8}-2\sqrt{9x-18}-\dfrac{3}{4}\sqrt{16x-32}=3\)