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2018年包头市中考题，考查三角形的内角和和外角和公式，你会吗？
如图，在△ABC中，AB=AC，△ADE的顶点D，E分别在BC，AC上，且∠DAE=90°，AD=AE．若∠C+∠BAC=145°，则∠EDC的度数为（ ）A．17.5° B．12.
中考压轴题合集42/108
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