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如图,BD是菱形ABCD的对角线,∠CBD=75°, (1)请用尺规作图法,作AB的垂直平分线EF,垂足为E,交AD于F;(不要求写作法,保留作图痕迹) (2)在(1)条件下,连接BF,求∠DB...
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