AC5cosC的精選

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△ABC中，AB=，AC=5,cosC=，則BC的值爲                            ...

△ABC中，AB=，AC=5,cosC=，則BC的值爲                            ...

2021-11-09
問題詳情：△ABC中，AB=，AC=5,cosC=，則BC的值爲                                （   ）  A．4              B．5              C．4或5          D．2...