关于3sinA5sinB的百科

• 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...

• 问题详情：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 【回答】知识点：未...
• 2021-04-0229961