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已知:如图,在△ABC中,.(1)求证:;(2)如果AC=3,EC=1,求的值.
试题详情
已知:如图,在△ABC中,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAD8AAAAjCAYAAAAjS9I/AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
.
(1)求证:
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAD8AAAAjCAYAAAAjS9I/AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
;
(2)如果AC=3,EC=1,求
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAC8AAAAxCAYAAABK+/BHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
的值.
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.
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;
(2)如果AC=3,EC=1,求
的值.
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