分析:由余弦定理且B=60°得b2=a2+c2-ac,再由b2=ac,得a2+c2-ac=ac,得a=c,得A=B=C=60°,得△ABC的形状是等边三角形.由余弦定理得:b2=a2+c2-2accosB=a2+c2-ac,又b2=ac,∴a2+c2-ac=ac,∴(a-c)2=0,∴a=c,∴A=B=C=60°...
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