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【一道题】正方形坐标题

Floor 1 魔法绿骑士 5/6/11 21:01

 

如图,已知四边形ABCO是正方形,O是原点。点E为AB的中点。连接AC、BO,交于点F,且C点的坐标为(7,1)。
(1)            求E点和F点的坐标;
(2)            求直线AB的解析式。

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