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已知函数f(x)=(m-1)x2+(m-2)x+(m2-7m+12)为偶函数,则...
已知函数f(x)=(m-1)x2+(m-2)x+(m2-7m+12)为偶函数,则m的值是( )
A.1
B.2
C.3
D.4
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