A+C=2B,==> B=60,log4sinA+log4sinC=-1 ==> sinAsinC = 1/4面积 = 根号3 = a*b*sinC/2 ...(1)面积 = 根号3 = b*c*sinA/2 ...(2)面积 = 根号3 = c*a*sinB/2 = c*a*[(根号3)/2]/2...(3)(3):==> c*a = 4 ...(4)(1)*(2):...