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a\()\)x\(=\)\((\)-3x7\()\)\(\div\)4 

x\(=\)-21​\(\div\)4​

x​​

-_-

A) \(\sqrt{\left(2-\sqrt{3}\right)^2}+2\sqrt{3}\)

       = \(2-\sqrt{3}+2\sqrt{3}\)

           = \(2+\sqrt{3}\)

b)\(\sqrt{18}-2\sqrt{50}+2\sqrt{8}+\sqrt[3]{27}\)

  =\(3\sqrt{2}-10\sqrt{2}+4\sqrt{2}+3\)

=\(-3\sqrt{2}+3\)

C)\(\dfrac{4}{\sqrt{5}-1}-\dfrac{10}{\sqrt{5}}+\dfrac{\sqrt{125}}{\sqrt{5}}+\sqrt{2}.\sqrt{\dfrac{5}{2}}\)

=\(\dfrac{4.\left(\sqrt{5}+1\right)}{\sqrt{5^2}-1^2}-\dfrac{2.5}{\sqrt{5}}+\sqrt{\dfrac{125}{5}}+\sqrt{2}.\dfrac{\sqrt{5}}{\sqrt{2}}\)

\(\sqrt{5}+1-2\sqrt{5}+\sqrt{25}+\sqrt{5}\)