1.(1)C=180°-A-B=90°,b=a/根号3=根号3,c=2/根号3*a=2根号3
(2)C=180°-A-B=60°,a=b/sinB*sinA=16/(1+根号3),c=b/sinB*sinC=12根号2-4根号6
(3)sinB=b*sinA/a=1/2,B=30°,C=180°-A-B=90°,c=a/sinA*sinC=2根号3
(4)sinA=a*sinB/b=3根号2/4,A=arcsin(3根号2/4)(我没计算器,楼主自己算吧),C=180°-A-B=135°-A,c=b/sinB*sinC
(5)sinC=c*b/sinB= ,A=180°-B-C= ,a=c/sinC*sinA=
2.令a/sinA=b/sinB=c/sinC=k,
sinA=a/k,sinB=b/k,sinC=c/k
sinA+sinB/sinC=a/k+(b/k)/(c/k)=a/k+b/c
这里是不写错了?证明的是a+sinB/sinC=sinA+b/c吧?