如图,在等腰梯形ABCD中,AD∥BC,对角线AC,BD相交于点O,以下四个结论:①∠ABC=∠DCB,②OA=OD,∠BCD=∠BDC,④S△AOB=S△DOC,其中正确的个数是( )(A)1(B)2(C)3(D)4
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![如图,在等腰梯形ABCD中,AD∥BC,对角线AC,BD相交于点O,以下四个结论:①∠ABC=∠DCB,②OA=OD,∠BCD=∠BDC,④S△AOB=S△DOC,其中正确的个数是( )(A)1(B)2(C)3(D)4](/uploads/image/z/2703695-23-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%88%A5BC%2C%E5%AF%B9%E8%A7%92%E7%BA%BFAC%2CBD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9O%2C%E4%BB%A5%E4%B8%8B%E5%9B%9B%E4%B8%AA%E7%BB%93%E8%AE%BA%EF%BC%9A%E2%91%A0%E2%88%A0ABC%3D%E2%88%A0DCB%2C%E2%91%A1OA%3DOD%2C%E2%88%A0BCD%3D%E2%88%A0BDC%2C%E2%91%A3S%E2%96%B3AOB%3DS%E2%96%B3DOC%2C%E5%85%B6%E4%B8%AD%E6%AD%A3%E7%A1%AE%E7%9A%84%E4%B8%AA%E6%95%B0%E6%98%AF%EF%BC%88+%EF%BC%89%EF%BC%88A%EF%BC%891%EF%BC%88B%EF%BC%892%EF%BC%88C%EF%BC%893%EF%BC%88D%EF%BC%894)
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