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如图,在矩形ABCD中,E、F分别是边AB、CD的中点,连接AF,CE.
(1)求证:△BEC≌△DFA;
(2)求证:四边形AECF是平行四边形.
考点分析:
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已知⊙O
1与⊙O
2的半径分别为3cm和5cm,若圆心距O
1O
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B.相离
C.内切
D.外切
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