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∵A=30°,B=45°,∴C=180°-30°-45°=105°,由asinA=bsinB,asinA=csinC,得b=sinBsinA•a=sin45°sin30°×22=2212×22=4,c=sinCsinA•a=sin105°sin30°×22=6+2412×22=2(3+1).
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