解一元二次方程,用直接开平方法,配方法,公式解法,因式分解法来做!

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• 2一名男工长期从事汞作业，有神经衰弱症状和尿汞升高等症状，已诊断为轻度汞吸收，较早和较好的处理

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• 3我们已经学习了一元二次方程的四种解法：因式分解法,开平方法,配方法和公式法.选择你认为适当的方法解下
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• 4What does "His parents are dead against the trip" mean？A．His parents are dead because of m

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• 6The caller warned that the bomb would explode when the plane______.A．took off from New Yor

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• 9因式分解一题.9（m+n)^2-4(m-n)^2
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• 10It can be inferred that______.A．the Japanese government has contributed to the saving of t

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