一道数学题.不是很难的.(1)如图,在△ABC中,∠ACB=100°,AC=AE,BC=BD,则∠DEC的度数为( )A.20° B.25° C.30° D.40°
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![一道数学题.不是很难的.(1)如图,在△ABC中,∠ACB=100°,AC=AE,BC=BD,则∠DEC的度数为( )A.20° B.25° C.30° D.40°](/uploads/image/z/12700797-69-7.jpg?t=%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98.%E4%B8%8D%E6%98%AF%E5%BE%88%E9%9A%BE%E7%9A%84.%EF%BC%881%EF%BC%89%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0ACB%3D100%C2%B0%2CAC%3DAE%2CBC%3DBD%2C%E5%88%99%E2%88%A0DEC%E7%9A%84%E5%BA%A6%E6%95%B0%E4%B8%BA%EF%BC%88+%EF%BC%89A.20%C2%B0+B.25%C2%B0+C.30%C2%B0+D.40%C2%B0)
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