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若函数f(x)=kx2+(k-1)x+2是偶函数,则k的值是 .
若函数f(x)=kx2+(k-1)x+2是偶函数,则f(x)的递减区间是________.
若函数f(x)=kx2+(k-1)x+2是偶函数,则k的值是________.