giải ptr

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

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

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

Tính

A=\(\left(\sqrt{72}-3\sqrt{24}+5\sqrt{8}\right)\sqrt{2}+4\sqrt{27}\)

B=\(\dfrac{1}{\sqrt{2}-1}+\dfrac{14}{3+\sqrt{2}}\)

C=\(\dfrac{5+3\sqrt{5}}{\sqrt{5}}+\dfrac{3+\sqrt{3}}{\sqrt{3}+1}-\left(\sqrt{5}+3\right)\)

D=\(\dfrac{30}{\sqrt{6}+1}+\dfrac{2}{\sqrt[]{6}-2}-\dfrac{6}{3-\sqrt{6}}\)

Tính \(sin^210^o+sin^220^o+sin^230^o+...+sin^280^o\)

Giai chi tiết cho mk vs ạ mk cảm ơn

Tính

\(\dfrac{sin70^o}{2cos15^o}\)

Giai chi tiết cho mk vs ạ mk cảm ơn

Cho cotα=\(\dfrac{5}{12}\) Tính sinα,cosα,tanα