19.20题怎么写?跪谢

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19.20题怎么写?跪谢
19.20题怎么写?跪谢
 

19.20题怎么写?跪谢

OA=AB÷cos∠OAB=12÷cos28°=12÷0.9
            OF=OA×sin∠OAM=OA×sin44°=12÷0.9×0.7
            塑像顶端到地面F距离=OF+1.5
                                              =12÷0.9×0.7+1.5
                                              =9.06