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在灯塔O处观测到轮船A位于北偏西54°的方向，同时轮船B在南偏西15°的方向．（1）∠AON= °；∠AOE= °（2）求∠AOB的度数．
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如图在灯塔O.处观测到轮船A.位于北偏西54°的方向同时轮船B.在南偏东15°的方向那么∠AOB=.
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向则∠AOB的大小为
69°
111°
159°
141°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
69°
111°
141°
159°
如图在灯塔O处观测到轮船A位于北偏西56°的方向同时轮船B在南偏东17°的方向那么∠AOB的大小为
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向则∠AOB的大小为
69°
111°
159°
141°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
70°
110°
120°
141°
在灯塔O处观测到轮船A位于北偏西54°的方向上同时轮船B在南偏东15°的方向那么∠AOB的大小为
69°
111°
141°
159°
如图在灯塔O.处观测到轮船A.位于北偏西54°的方向同时轮船B.在南偏东15°的方向那么∠AOB=_
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
69°
111°
159°
141°
如图在灯塔O处观测到轮船A位于北偏西54°35′的方向上同时轮船B在北偏东15°45′的方向上那么∠
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向则∠AOB的大小为
69°
111°
159°
141°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
69°
111°
141°
159°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
69°
111°
141°
159°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向则∠AOB的大小为
69°
111°
159°
141°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
69°
111°
141°
159°
如图在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB=．
轮船航行到C.处时观测到小岛B.的方向是北偏西65°那么同时从B.处观测到轮船的方向是
南偏西65°
东偏西65°
南偏东65°
西偏东65°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
70°
110°
120°
141°
在灯塔O处观测到轮船A位于北偏西65°的方向同时轮船B在南偏东34°的方向那么∠AOB的大小为
69°
111°
149°
159°
在灯塔O处观测到轮船A位于北偏西54°的方向同时轮船B在南偏东15°的方向那么∠AOB的大小为
70°
110°
120°
141°
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