已知四边形abcd中,ab=ad,∠bad=60°,∠bcd=120°,求证:bc+cd=ac
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![已知四边形abcd中,ab=ad,∠bad=60°,∠bcd=120°,求证:bc+cd=ac](/uploads/image/z/5520866-50-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9B%9B%E8%BE%B9%E5%BD%A2abcd%E4%B8%AD%2Cab%3Dad%2C%E2%88%A0bad%3D60%C2%B0%2C%E2%88%A0bcd%3D120%C2%B0%2C%E6%B1%82%E8%AF%81%EF%BC%9Abc%2Bcd%3Dac)
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