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6-2\times \frac{\sqrt{3}}{\sqrt{2}}-3\times \frac{\sqrt{3}}{2}
Rewrite the square root of the division \sqrt{\frac{3}{2}} as the division of square roots \frac{\sqrt{3}}{\sqrt{2}}.
6-2\times \frac{\sqrt{3}\sqrt{2}}{\left(\sqrt{2}\right)^{2}}-3\times \frac{\sqrt{3}}{2}
Rationalize the denominator of \frac{\sqrt{3}}{\sqrt{2}} by multiplying numerator and denominator by \sqrt{2}.
6-2\times \frac{\sqrt{3}\sqrt{2}}{2}-3\times \frac{\sqrt{3}}{2}
The square of \sqrt{2} is 2.
6-2\times \frac{\sqrt{6}}{2}-3\times \frac{\sqrt{3}}{2}
To multiply \sqrt{3} and \sqrt{2}, multiply the numbers under the square root.
6-\sqrt{6}-3\times \frac{\sqrt{3}}{2}
Cancel out 2 and 2.
6-\sqrt{6}-\frac{3\sqrt{3}}{2}
Express 3\times \frac{\sqrt{3}}{2} as a single fraction.
\frac{2\left(6-\sqrt{6}\right)}{2}-\frac{3\sqrt{3}}{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply 6-\sqrt{6} times \frac{2}{2}.
\frac{2\left(6-\sqrt{6}\right)-3\sqrt{3}}{2}
Since \frac{2\left(6-\sqrt{6}\right)}{2} and \frac{3\sqrt{3}}{2} have the same denominator, subtract them by subtracting their numerators.
\frac{12-2\sqrt{6}-3\sqrt{3}}{2}
Do the multiplications in 2\left(6-\sqrt{6}\right)-3\sqrt{3}.