3倍根号18+5分之1倍根号50-4倍根号2分之1=3倍根号2x9+1/5根号25x2-2倍根号2=9倍根号2+根号2-2倍根号2=8倍根号2
解：3根号18+根号50/3-2根号2 =9根号2+5根号2/3-2根号2 =7根号2+5根号2/3 =26根号2/3
