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

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

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

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

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

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

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

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