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P为○2 上一动点   圆1与○2 相交于AB 两点 连接PA延长至○1于C ……PB…………于D 说明弦CD与动点P的关系 并说理由 有图有真相
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http://tieba.baidu.com/mo/q/checkurl?url=http%3A%2F%2Fzhidao.baidu.com%2Fques……
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正方形ABCD中  P是其内部一点  PA:PB:PC=1:2:3  角APB为  A。120° B 135° C 150°  D。以上都不对  我选B ……
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🧑lyh0309
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