1.已知x=a/|a|+|b|/b+c/|c|,且abc<0,求(1/x-2)-(1/x^2-4).(P31) 2.已知在△ABC中,AE平分∠BAC,∠C>∠B,F为AE上的一点,且FD⊥BC于D.(1).证明:∠EFD=1/2(∠C-∠B).(P42) 3.一空瓶装满水后总质量为32g,装
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![1.已知x=a/|a|+|b|/b+c/|c|,且abc<0,求(1/x-2)-(1/x^2-4).(P31) 2.已知在△ABC中,AE平分∠BAC,∠C>∠B,F为AE上的一点,且FD⊥BC于D.(1).证明:∠EFD=1/2(∠C-∠B).(P42) 3.一空瓶装满水后总质量为32g,装](/uploads/image/z/5085639-63-9.jpg?t=1.%E5%B7%B2%E7%9F%A5x%3Da%2F%7Ca%7C%2B%7Cb%7C%2Fb%2Bc%2F%7Cc%7C%2C%E4%B8%94abc%26lt%3B0%2C%E6%B1%82%281%2Fx-2%29-%281%2Fx%5E2-4%29.%EF%BC%88P31%EF%BC%89+2.%E5%B7%B2%E7%9F%A5%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAE%E5%B9%B3%E5%88%86%E2%88%A0BAC%2C%E2%88%A0C%26gt%3B%E2%88%A0B%2CF%E4%B8%BAAE%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2C%E4%B8%94FD%E2%8A%A5BC%E4%BA%8ED.%EF%BC%881%EF%BC%89.%E8%AF%81%E6%98%8E%EF%BC%9A%E2%88%A0EFD%3D1%2F2%EF%BC%88%E2%88%A0C-%E2%88%A0B%EF%BC%89.%EF%BC%88P42%EF%BC%89+3.%E4%B8%80%E7%A9%BA%E7%93%B6%E8%A3%85%E6%BB%A1%E6%B0%B4%E5%90%8E%E6%80%BB%E8%B4%A8%E9%87%8F%E4%B8%BA32g%2C%E8%A3%85)
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