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若m-2n+3=0,则m2-4mn+4n2的值是 .
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教案备课库《八年级大班数学学科月考试题》真题及答案
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若x=1是方程mx2+3x+n=0的根求m-n2+4mn的值
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2
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若n>0且对于所有的x9x2+mx+36=3x+n2都成立则m-n的值为
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