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数学
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已知幂函数f(x)=x^(m^2-4m)(m∈Z)的图像关于y轴对称,且在区间(0,+∞)为减函数,m=?
人气:108 ℃ 时间:2019-08-20 12:27:54
解答
x>0时是减函数则系数小于0
m^2-4m=m(m-4)
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