a/sinA=√3/sin60°=√3÷(√3/2)=2
由正弦定理得:a/sinA=b/sinB=c/sinC=2
∴a=2sinA b=2sinB c=2sinC
∴a+b-c/sinA+sinB-sinC
=(2sinA+2sinB-2sinC)/(sinA+sinB-sinC)=2
a/sinA=√3/sin60°=√3÷(√3/2)=2
由正弦定理得:a/sinA=b/sinB=c/sinC=2
∴a=2sinA b=2sinB c=2sinC
∴a+b-c/sinA+sinB-sinC
=(2sinA+2sinB-2sinC)/(sinA+sinB-sinC)=2