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幻灯片 1

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若正确,请证明;若不正确,请举出反例. (3)已知:在“等对角四边形”ABCD中,∠DAB=60°,∠ABC=90°,AB=5,AD=4.求对角线AC的长. 图Z4-3解:(1) ...

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幻灯片 1