(2013•泰安)分解因式:m3-4m= .
考点分析:
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(2010•杭州)定义[a,b,c]为函数y=ax
2+bx+c的特征数,下面给出特征数为[2m,1-m,-1-m]的函数的一些结论:
①当m=-3时,函数图象的顶点坐标是(
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,
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);
②当m>0时,函数图象截x轴所得的线段长度大于
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;
③当m<0时,函数在x>
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时,y随x的增大而减小;
④当m≠0时,函数图象经过同一个点.
其中正确的结论有( )
A.①②③④
B.①②④
C.①③④
D.②④
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A.
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C.
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D.
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