若在△ABC中,∠A=60°,b=1,SΔABC=√3,则(α+b+c)/(sinA+sinB+sinC)=_____.
若在△ABC中,∠A=60°,b=1,SΔABC=√3,则(α+b+c)/(sinA+sinB+sinC)=_____.
【正确答案】:2√39/3。解析:SΔABC=(1/2)bcsinA=(1/2)c×(√3/2)=√3,c=4,由余弦定理知α2=13,α=√13,(α2+b2+c2)/(sinA+sinB+sinC)=α/sinA=√3/(√3/2)=2√39/2
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