已知线段AB=18cm,C点在AB延长线上,AC=3分之5BC,则BC=?为什莫AB是BC的3分之2呢?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 10:09:20
![已知线段AB=18cm,C点在AB延长线上,AC=3分之5BC,则BC=?为什莫AB是BC的3分之2呢?](/uploads/image/z/6626575-55-5.jpg?t=%E5%B7%B2%E7%9F%A5%E7%BA%BF%E6%AE%B5AB%3D18cm%2CC%E7%82%B9%E5%9C%A8AB%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%2CAC%3D3%E5%88%86%E4%B9%8B5BC%2C%E5%88%99BC%3D%3F%E4%B8%BA%E4%BB%80%E8%8E%ABAB%E6%98%AFBC%E7%9A%843%E5%88%86%E4%B9%8B2%E5%91%A2%3F)
已知线段AB=18cm,C点在AB延长线上,AC=3分之5BC,则BC=?为什莫AB是BC的3分之2呢?
已知线段AB=18cm,C点在AB延长线上,AC=3分之5BC,则BC=?为什莫AB是BC的3分之2呢?
已知线段AB=18cm,C点在AB延长线上,AC=3分之5BC,则BC=?为什莫AB是BC的3分之2呢?
C点在AB延长线上
所以:AC=AB+BC
而:AC=5BC/3
所以:AB=AC-BC=2BC/3
BC=3AB/2=3/2*18=27cm
AC=(5/3)BC
AB+BC=(5/3)BC
18+BC=(5/3)BC
18=[(5/3)-1]BC
(2/3)BC=18
BC=27cm
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