1.为了躲避台风,两个海洋巡逻船分别抛锚在两荒岛C、D处,A、B为两船舶...答:∠ACB=75°∠BCD=45°∠ADC=30°∠ADB=45° 设CD=X,AC=X,AD=X√3,设BC,AD交点O,∠AOC=75°,AO=AC=X OD=X(√3-1)BD=CD*sin45°/sin60°=X√6/3 OC=ACsin30°/sin75° BC=Xsin75°/sin60° X/sinB=BC/sinA,sinA/sinB=1.115 A+B=105°,A=105°-B;其中,∠ACB=B,...