【評論主題】9.设△ABC的内角A,B,C所对边的长分别为a,b,c，若b+c=2a,3sinA=5sinB,则角C=(A)π/3(B)2π/3(C)3π/4(D)5π/6
【評論內容】3sinA=5sinB => 3☆=5☆...