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zcz 已知：如图,△ABC的两条高BE,CF相交与点O.求证：∠BOC＝180°-∠A图:http://hi.baidu.com/zcz%5Fcom/blog/item/6daba950cf47dc6184352478.html 数学初中几何题(有关矩形),如图,在四边形ABCD中,∠ABC=∠ADC=Rt∠,M是AC的中点,N是BD的中点,判断MN与BD的位置关系,为什么?图:http://hi.baidu.com/zcz%5Fcom/blog/item/ee14db50eaeb425f1138c23d.html 数学初中几何题(有关矩形),如图,在矩形ABCD中,E是CD上一点,AB=AE,若∠AED=30°,求∠EBC的度数.图:http://hi.baidu.com/zcz%5Fcom/blog/item/7518b5d6b1d11a2c06088b22.html