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226) $2 \sqrt{2} -\sqrt{18} +\sqrt{3} =2\sqrt{2} -3\sqrt{2} +\sqrt{3} =\sqrt{3} -\sqrt{2}$

228) $\sqrt{8}-3\sqrt{2}+\sqrt{6}=2\sqrt{2}-3\sqrt{2}+\sqrt{6}=\sqrt{6}-\sqrt{2}$

230) $3\sqrt{2}*\sqrt{5}*4\sqrt{10}=3\sqrt{10}*4\sqrt{10}=12*10=120$

232) $\sqrt{3}*\sqrt{8}*\sqrt{6}=\sqrt{3}*2\sqrt{2}*\sqrt{6}=2\sqrt{6}*\sqrt{6}=2*6=12$

236) $\frac{ \sqrt{5}*\sqrt{12} }{\sqrt{20}} = \frac{\sqrt{5}*2\sqrt{3}}{2\sqrt{5}} = \sqrt{3}$

238) $\frac{\sqrt{14}}{\sqrt{6}*\sqrt{21}} = \frac{\sqrt{2}*\sqrt{7}}{\sqrt{2}*\sqrt{3}*\sqrt{7}*\sqrt{3}} = \frac{1}{3}$

240) $\frac{\sqrt{50}*\sqrt{6}}{\sqrt{12}} = \frac{5\sqrt{2}*\sqrt{2}*\sqrt{3}}{2\sqrt{3}} =5$

247) $\sqrt{3^6*2^4*5^2} =3^3*2^2*5=27*4*5=27*20=540$

248) $\sqrt{2^8*5^2*3^4} =2^4*5*3^2=16*5*9=80*9=720$