难.)已知O为四边形ABCD内一点.OA=OB=OC,∠ABC=∠ADC=70°,则∠ADO+∠DCO的大小是( A.70° B.110° C.140° D.150°我知道答案为D,但不知道是怎么算的,OK?
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![难.)已知O为四边形ABCD内一点.OA=OB=OC,∠ABC=∠ADC=70°,则∠ADO+∠DCO的大小是( A.70° B.110° C.140° D.150°我知道答案为D,但不知道是怎么算的,OK?](/uploads/image/z/10738613-29-3.jpg?t=%E9%9A%BE.%29%E5%B7%B2%E7%9F%A5O%E4%B8%BA%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E5%86%85%E4%B8%80%E7%82%B9.OA%3DOB%3DOC%2C%E2%88%A0ABC%3D%E2%88%A0ADC%3D70%C2%B0%2C%E5%88%99%E2%88%A0ADO%2B%E2%88%A0DCO%E7%9A%84%E5%A4%A7%E5%B0%8F%E6%98%AF%EF%BC%88+A.70%C2%B0+B.110%C2%B0+C.140%C2%B0+D.150%C2%B0%E6%88%91%E7%9F%A5%E9%81%93%E7%AD%94%E6%A1%88%E4%B8%BAD%2C%E4%BD%86%E4%B8%8D%E7%9F%A5%E9%81%93%E6%98%AF%E6%80%8E%E4%B9%88%E7%AE%97%E7%9A%84%2COK%EF%BC%9F)
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